If you are new to micro crawlers, RC rock crawlers or small-scale trail trucks, the amount of vehicle terminology can feel confusing at first. This glossary explains the key vehicle-related terms you are likely to see when choosing a crawler, comparing platforms, reading product descriptions or upgrading parts for models such as the Axial SCX24, Traxxas TRX-4M, FMS FCX24 and other popular micro crawler rigs.
These vehicle-related terms are useful when buying a new crawler, comparing upgrades, reading product descriptions, building a custom rig or choosing compatible micro crawler parts.
Vehicle Types, Sizes and Buying Terms
Micro Crawler
Plain English meaning: A small-scale radio-controlled crawler designed for slow, technical driving over rocks, obstacles, indoor courses and scale terrain.
Why it matters: Micro crawlers are compact, affordable and easy to run indoors, making them a great entry point into RC crawling and indoor crawler courses. They are also highly customisable with wheels, tyres, bodies, chassis parts and performance upgrades.
Related Terms: 1/24 scale, 1/18 scale, RC crawler, crawler course, micro crawler upgrades
Mini Crawler
Plain English meaning: A small RC crawler, usually larger than a micro crawler but smaller than a full-size 1/10 scale crawler.
Why it matters: Mini crawlers offer a balance between compact size and outdoor capability. They are often easier to drive over larger garden rocks and trail obstacles than very small 1/24 scale crawlers.
Related Terms: micro crawler, 1/18 scale, trail truck, RC rock crawler
RC Rock Crawler
Plain English meaning: A radio-controlled vehicle built to climb rocks, ledges, uneven surfaces and technical terrain at low speed.
Why it matters: Unlike fast RC cars, rock crawlers are designed around grip, torque, suspension movement and control. Understanding this helps when choosing crawler tyres, crawler wheels, motors, gearing and suspension upgrades.
Related Terms: micro crawler, scale crawler, trail truck, line choice, crawler tyres
Scale Crawler
Plain English meaning: An RC crawler designed to look like a real off-road vehicle, often with realistic bodies, bumpers, lights, roof racks and accessories.
Why it matters: Scale crawlers focus on realism as well as performance. They are popular with builders who enjoy custom bodies, weathering, lighting kits and scale crawler accessories.
Related Terms: hard body, Lexan body, scale accessories, trail truck, body shell
Trail Truck
Plain English meaning: A crawler-style RC vehicle designed for realistic trail driving rather than pure competition crawling.
Why it matters: Trail trucks usually combine scale looks with capable crawling performance. They are ideal for garden trails, woodland paths, homemade crawler courses and relaxed driving sessions.
Related Terms: scale crawler, RC rock crawler, crawler course, line choice, scale accessories
Comp Crawler
Plain English meaning: A crawler built mainly for competition performance rather than scale realism.
Why it matters: Comp crawlers often use lightweight bodies, low centre of gravity chassis setups, aggressive tyres and performance-focused geometry. They are built to clear difficult gates, climbs and sidehills on crawler competition courses.
Related Terms: LCG chassis, gate, sidehill, overdrive, crawler competition terms
Rig
Plain English meaning: A common hobby term for an RC crawler vehicle.
Why it matters: You will often see people refer to their crawler as a rig when discussing builds, upgrades, setups and custom projects. For example, a modified SCX24 or TRX-4M might be described as a custom micro crawler rig.
Related Terms: custom build, micro crawler, crawler upgrades, RC crawler
RTR – Ready To Run
Plain English meaning: A crawler that comes mostly assembled and ready to use, usually with the transmitter, receiver, motor and electronics already installed.
Why it matters: RTR crawlers are ideal for beginners because they reduce the amount of setup needed before driving. Many popular micro crawlers are sold as RTR models, making them easy first vehicles.
Related Terms: kit, roller, transmitter, receiver, beginner micro crawler
Kit
Plain English meaning: An RC crawler supplied as parts that need to be assembled before use.
Why it matters: A kit gives you more control over the build and helps you understand how the crawler works. Kits can be a good choice if you want to choose your own ESC, motor, servo, wheels, tyres and body from the start.
Related Terms: RTR, roller, custom build, crawler electronics, crawler tools
Roller
Plain English meaning: A crawler chassis that rolls on its wheels but usually does not include all the electronics needed to run.
Why it matters: A roller is useful for custom builds because you can add your own servo, motor, ESC, receiver and battery. It can be a good base for a high-performance micro crawler build.
Related Terms: kit, RTR, crawler electronics, custom micro crawler, servo upgrade
Platform
Plain English meaning: The base vehicle model or family that parts and upgrades are designed around.
Why it matters: Compatibility is one of the most important things in micro crawling. A part made for an Axial SCX24 may not fit a Traxxas TRX-4M or FMS FCX24, so knowing your platform helps you buy the correct upgrades.
Related Terms: fitment, compatibility, SCX24 parts, TRX-4M parts, FCX24 parts
1/24 Scale
Plain English meaning: A scale size where the RC vehicle is roughly one twenty-fourth the size of a real vehicle.
Why it matters: 1/24 scale is one of the most popular sizes for micro crawlers. These vehicles are small enough for indoor courses but still capable of technical crawling with the right tyres, weight setup and micro crawler upgrades.
Related Terms: micro crawler, SCX24, FCX24, wheelbase, indoor crawler course
1/18 Scale
Plain English meaning: A scale size where the RC vehicle is roughly one-eighteenth the size of a real vehicle.
Why it matters: 1/18 scale crawlers are larger than 1/24 scale crawlers, which can make them more stable outdoors and more capable on larger obstacles. They are still compact enough for many home and garden crawler setups.
Related Terms: TRX-4M, FCX18, mini crawler, trail truck, crawler tyres
Chassis, Body and Vehicle Geometry Terms
Wheelbase
Plain English meaning: The distance between the front axle and rear axle.
Why it matters: Wheelbase affects stability, turning circle, climbing ability and how easily a crawler gets stuck on obstacles. Longer wheelbases can feel more stable, while shorter wheelbases can be more manoeuvrable on tight crawler courses.
Related Terms: track width, ground clearance, breakover angle, suspension links, wheelbase stretch
Track Width
Plain English meaning: The width of the vehicle measured across the wheels, usually from one side to the other.
Why it matters: Wider track width can improve stability on sidehills, but it can also make the crawler harder to fit through narrow gates and scale obstacles. It is commonly changed with wheel offset, wider axles or hex extensions.
Related Terms: wheel offset, hex extensions, sidehill, gate, crawler wheels
Ground Clearance
Plain English meaning: The space between the lowest part of the crawler and the ground.
Why it matters: More ground clearance can help a crawler clear rocks, roots and obstacles. However, raising the vehicle too much can increase the centre of gravity, making it easier to roll over on climbs and sidehills.
Related Terms: centre of gravity, skid plate, belly clearance, portal axle, crawler suspension
Centre of Gravity
Plain English meaning: The point where the vehicle’s weight is balanced.
Why it matters: A lower centre of gravity helps a crawler stay planted on climbs, descents and sidehills. Many performance upgrades, such as brass crawler parts, low-mounted batteries and LCG chassis kits, are designed to improve weight balance.
Related Terms: LCG chassis, brass upgrades, sidehill, weight bias, ground clearance
Chassis
Plain English meaning: The main structure of the crawler that holds the axles, suspension, transmission, battery, electronics and body.
Why it matters: The chassis affects strength, weight, clearance and how the vehicle performs. Upgrading the chassis is a common step when building a more capable custom micro crawler.
Related Terms: chassis rails, LCG chassis, skid plate, carbon chassis, crawler upgrades
Chassis Rails
Plain English meaning: The long side pieces of the chassis that form the main frame of the vehicle.
Why it matters: Chassis rails influence body mounting, suspension geometry and where parts can be placed. Aftermarket rails are often used to reduce weight, improve clearance or create a lower centre of gravity.
Related Terms: ladder chassis, LCG chassis, carbon chassis, skid plate, body mounts
Ladder Chassis
Plain English meaning: A chassis design with two long rails connected by crossmembers, similar to many real off-road vehicles.
Why it matters: Ladder chassis designs are common on scale crawlers because they look realistic and provide a strong base for bodies, bumpers and accessories.
Related Terms: chassis rails, scale crawler, hard body, crossmember, trail truck
LCG Chassis
Plain English meaning: A low centre of gravity chassis designed to keep weight lower in the vehicle.
Why it matters: An LCG chassis can improve climbing, sidehilling and overall stability. It is a popular upgrade for drivers who want more performance from a micro crawler without relying only on heavier brass parts.
Related Terms: centre of gravity, carbon chassis, brass upgrades, sidehill, comp crawler
Skid Plate
Plain English meaning: The smooth plate underneath the centre of the chassis that helps the crawler slide over rocks and obstacles.
Why it matters: A good skid plate helps prevent the crawler from getting caught on sharp edges. Skid shape and clearance can make a big difference on ledges, breakovers and technical rock gardens.
Related Terms: belly clearance, breakover angle, chassis, rock garden, high centred
Belly Clearance
Plain English meaning: The amount of space under the centre section of the crawler, usually around the skid plate.
Why it matters: Better belly clearance helps a crawler pass over raised obstacles without getting stuck. Too much height, however, can raise the centre of gravity and reduce stability.
Related Terms: skid plate, ground clearance, breakover angle, centre of gravity, crawler course obstacles
Body Shell
Plain English meaning: The outer body of the crawler that gives it the look of a truck, SUV, pickup, buggy or custom vehicle.
Why it matters: The body affects the crawler’s appearance, weight, clearance and rollover behaviour. A lighter body may perform better, while a detailed body can improve scale realism.
Related Terms: hard body, Lexan body, cab-only body, body mounts, scale crawler accessories
Hard Body
Plain English meaning: A rigid plastic crawler body, often with more realistic details than a thin flexible body shell.
Why it matters: Hard bodies look realistic and are great for scale builds, but they are usually heavier than Lexan bodies. That extra weight can raise the centre of gravity and affect crawling performance.
Related Terms: scale crawler, Lexan body, centre of gravity, body shell, scale accessories
Lexan Body
Plain English meaning: A lightweight, flexible polycarbonate body shell used on many RC vehicles.
Why it matters: Lexan bodies are light and durable, which can help performance on technical climbs and sidehills. They are often used when drivers want a practical body that does not add too much weight high up on the crawler.
Related Terms: body shell, hard body, polycarbonate body, LCG chassis, crawler body
Cab-Only Body
Plain English meaning: A body setup that uses only the front cab section rather than a full truck body.
Why it matters: Cab-only bodies can reduce weight and improve clearance around the rear of the vehicle. They are popular on performance-focused micro crawler builds and truggy-style rigs.
Related Terms: truggy body, LCG chassis, custom build, crawler body, weight reduction
Truggy Body
Plain English meaning: A hybrid body style that usually combines a truck cab with an open rear cage or flatbed design.
Why it matters: Truggy bodies can give a crawler a custom look while improving clearance and reducing rear body weight. They are common on modified micro crawler builds.
Related Terms: cab-only body, roll cage, flatbed, custom micro crawler, scale accessories
Body Posts
Plain English meaning: Small posts that hold the body shell to the chassis.
Why it matters: Body posts affect how the body sits on the crawler. Adjusting or trimming body posts can help improve clearance, stance and body fitment.
Related Terms: body shell, magnetic body mounts, body clips, crawler body, fitment
Magnetic Body Mounts
Plain English meaning: Body mounts that use magnets instead of traditional body clips or screws.
Why it matters: Magnetic mounts make it easier to remove the body for battery changes, repairs and adjustments. They also give a cleaner look on scale builds because there are no visible body clips.
Related Terms: body posts, body shell, scale crawler, battery tray, crawler accessories
Bumper
Plain English meaning: The front or rear protective part of the crawler body or chassis.
Why it matters: Bumpers can improve scale looks and protect the body, but large bumpers may reduce approach or departure angle. Many crawler owners trim, replace or upgrade bumpers to improve performance.
Related Terms: approach angle, departure angle, stinger bumper, winch, scale accessories
Rock Sliders
Plain English meaning: Protective rails fitted along the sides of the crawler body or chassis.
Why it matters: Rock sliders help the vehicle slide over rocks and protect the lower sides of the body. On scale builds, they also add realistic off-road detail.
Related Terms: skid plate, body shell, scale accessories, trail truck, crawler protection parts
Approach Angle
Plain English meaning: The steepest angle the front of the crawler can meet without the bumper or body hitting the obstacle first.
Why it matters: A better approach angle helps the front tyres reach rocks, ledges and ramps before the bumper gets caught. This is especially useful on technical crawler obstacles.
Related Terms: departure angle, breakover angle, bumper, line choice, rock crawling skills
Departure Angle
Plain English meaning: The steepest angle the rear of the crawler can leave an obstacle without the rear bumper or body catching.
Why it matters: Good departure angle helps prevent the back of the crawler from dragging when coming off rocks, ramps or ledges. Shorter rear overhangs usually improve departure angle.
Related Terms: approach angle, breakover angle, bumper, overhang, crawler course
Breakover Angle
Plain English meaning: The angle a crawler can pass over a peak, ridge or obstacle without getting stuck in the middle.
Why it matters: Breakover angle is important when driving over sharp crests, rocks and course features. Wheelbase, tyre size, skid plate shape and belly clearance all affect how easily a crawler gets high-centred.
Related Terms: wheelbase, skid plate, belly clearance, high centred, ground clearance
Axle, Steering and Suspension Terms
Solid Axle
Plain English meaning: An axle design where the left and right wheels are connected by one rigid axle housing.
Why it matters: Solid axles are common on crawlers because they are strong, simple and good for articulation. They also give scale crawlers a realistic off-road truck look.
Related Terms: portal axle, axle housing, articulation, suspension links, scale crawler
Portal Axle
Plain English meaning: An axle design that uses gears at the wheel ends to lift the axle housing higher than the wheel centreline.
Why it matters: Portal axles increase ground clearance under the axle, helping the crawler clear rocks and obstacles. They can also change gearing and torque behaviour, depending on the setup.
Related Terms: ground clearance, portal gears, axle housing, FCX24, TRX-4M
Worm Gear Axle
Plain English meaning: An axle that uses a worm gear drive inside the axle housing.
Why it matters: Worm gears provide strong gear reduction and excellent holding power on climbs and descents. They are commonly associated with some SCX24 crawler setups and can affect free-rolling speed and drivetrain feel.
Related Terms: gear reduction, axle housing, drag brake, SCX24 parts, drivetrain
Axle Housing
Plain English meaning: The outer case that holds the axle gears, shafts and related parts.
Why it matters: Axle housings affect strength, weight and clearance. Plastic housings are light, while aluminium or brass housings can add durability and weight lower down on the crawler.
Related Terms: solid axle, portal axle, brass axle housing, diff cover, axle shafts
Pumpkin
Plain English meaning: The rounded centre section of an axle housing where the gears sit.
Why it matters: The pumpkin is often the lowest part of a crawler axle, so it can catch on rocks. Portal axles and careful line choice can help reduce axle hang-ups.
Related Terms: diff housing, axle housing, portal axle, ground clearance, line choice
Locked Diff
Plain English meaning: A differential setup where both wheels on an axle turn together rather than independently.
Why it matters: Locked diffs are important for crawling because they keep power going to both wheels, even when one tyre has less grip. This improves climbing and traction on uneven terrain.
Related Terms: spool, traction, axle housing, RC crawling, drivetrain
Spool
Plain English meaning: A solid part that locks both axle shafts together so both wheels rotate at the same speed.
Why it matters: A spool gives crawler axles consistent traction and is commonly used instead of an open differential. It is helpful for climbing, but can make turning less smooth on high-grip surfaces.
Related Terms: locked diff, axle shafts, traction, crawler drivetrain, turning radius
C-Hub
Plain English meaning: A C-shaped steering part at the end of the axle that supports the steering knuckle.
Why it matters: C-hubs affect steering strength, geometry and durability. Upgraded C-hubs are often fitted when improving steering precision or replacing broken plastic parts.
Related Terms: steering knuckle, brass knuckles, axle housing, steering link, servo upgrade
Steering Knuckle
Plain English meaning: The part at the end of the front axle that turns the wheel left and right.
Why it matters: Steering knuckles affect durability, steering angle and weight placement. Brass steering knuckles are a common micro crawler upgrade because they add useful weight low and forward.
Related Terms: brass knuckles, C-hub, steering link, servo, front weight bias
Steering Link
Plain English meaning: A metal or plastic rod that connects the steering parts so the wheels turn together.
Why it matters: A strong steering link improves steering accuracy and durability. Bent or flexible steering links can make the crawler feel vague or reduce steering performance.
Related Terms: tie rod, drag link, steering knuckle, servo, servo horn
Servo on Axle
Plain English meaning: A steering setup where the servo is mounted directly on the axle.
Why it matters: Servo-on-axle setups are simple, direct and common on micro crawlers. They provide strong steering response but may look less scale than chassis-mounted steering.
Related Terms: servo, steering link, chassis mounted servo, CMS, micro crawler steering
Chassis Mounted Servo
Plain English meaning: A steering setup where the servo is mounted on the chassis instead of directly on the axle.
Why it matters: CMS setups can look more realistic and scale, but they require good steering geometry. Poor setup can cause bump steer or reduced steering performance.
Related Terms: servo on axle, panhard bar, steering link, scale crawler, bump steer
Panhard Bar
Plain English meaning: A suspension link that helps locate the axle from side to side, often used with chassis-mounted servo setups.
Why it matters: A panhard bar helps control axle movement and steering geometry. It is important on scale-style builds that use CMS steering rather than servo-on-axle steering.
Related Terms: chassis mounted servo, CMS, 3-link suspension, steering geometry, bump steer
Suspension Links
Plain English meaning: Rods that connect the axles to the chassis and control how the axles move.
Why it matters: Suspension links affect wheelbase, axle position, articulation and clearance. Upgrading to metal or high-clearance links is one of the most common micro crawler upgrades.
Related Terms: lower links, upper links, 4-link suspension, high clearance links, wheelbase
4-Link Suspension
Plain English meaning: A suspension setup using four links to locate an axle.
Why it matters: 4-link suspension is popular because it provides good axle control and articulation. It is commonly used on crawlers to improve stability and predictable suspension movement.
Related Terms: 3-link suspension, suspension links, articulation, panhard bar, crawler suspension
High-Clearance Links
Plain English meaning: Bent suspension links shaped to give more space under the vehicle.
Why it matters: High-clearance links help reduce link hang-ups on rocks and ledges. They are a popular upgrade for improving breakover performance and obstacle clearance.
Related Terms: suspension links, breakover angle, belly clearance, crawler upgrades, rock garden
Leaf Springs
Plain English meaning: Flat spring strips used to support the vehicle, similar to many older full-size trucks.
Why it matters: Leaf springs look realistic and are popular on scale builds, but they usually offer less articulation than link suspension. They are often chosen for realism rather than maximum crawler performance.
Related Terms: scale crawler, link suspension, articulation, trail truck, hard body
Coil Springs
Plain English meaning: Spiral-shaped springs used with shocks to support the vehicle and control suspension movement.
Why it matters: Softer or firmer springs can change how the crawler sits, grips and transfers weight. Spring choice affects ride height, flex and stability.
Related Terms: shocks, shock preload, ride height, droop, crawler suspension
Shocks
Plain English meaning: Suspension parts that help control how the crawler moves up and down over terrain.
Why it matters: Shocks affect ride height, articulation, stability and how smoothly the crawler handles obstacles. Upgraded shocks can improve control, but setup matters more than simply fitting longer shocks.
Related Terms: oil filled shocks, coil springs, shock oil, shock preload, articulation
Oil-Filled Shocks
Plain English meaning: Shocks filled with silicone oil to slow and smooth suspension movement.
Why it matters: Oil-filled shocks can make a crawler feel more controlled and less bouncy. They are often used to fine-tune suspension movement on upgraded micro crawler builds.
Related Terms: shocks, shock oil, shock preload, crawler suspension, suspension tuning
Shock Preload
Plain English meaning: The amount of compression applied to a spring before the vehicle is driven.
Why it matters: Preload changes ride height and how the crawler sits on its suspension. Too much preload can raise the vehicle and make it less stable, while too little can cause it to sit too low.
Related Terms: coil springs, shocks, ride height, centre of gravity, suspension tuning
Droop
Plain English meaning: The amount the suspension can extend downward when the wheels drop into a hole or over an edge.
Why it matters: Droop helps tyres stay in contact with uneven terrain. Too much droop can make the crawler unstable, while too little can reduce articulation and grip.
Related Terms: articulation, shocks, suspension travel, sidehill, crawler setup
Articulation
Plain English meaning: The ability of the axles and suspension to twist and move so the tyres stay in contact with the ground.
Why it matters: Good articulation helps maintain grip on uneven terrain. However, too much flex can make a crawler unpredictable, so the best setup is balanced rather than simply as flexible as possible.
Related Terms: flex, suspension links, droop, shocks, crawler suspension
Drivetrain and Gear Terms
Driveshaft
Plain English meaning: A rotating shaft that transfers power from the transmission to the axles.
Why it matters: Driveshafts need to be strong enough to handle torque, especially when the tyres are bound up on rocks. Metal driveshafts are a common durability upgrade on modified crawlers.
Related Terms: transmission, axle, metal driveshafts, torque, crawler drivetrain
Transmission
Plain English meaning: The gearbox that transfers power from the motor to the driveshafts and axles.
Why it matters: The transmission affects torque, wheel speed and reliability. Upgraded gears, different ratios or two-speed transmissions can change how a crawler performs on climbs and trails.
Related Terms: gear ratio, spur gear, pinion gear, driveshaft, two speed transmission
Transfer Case
Plain English meaning: A drivetrain part that sends power to the front and rear driveshafts.
Why it matters: Transfer cases are often used in scale crawler layouts to create realistic drivetrain positioning. They can also affect gearing, driveshaft angles and weight placement.
Related Terms: transmission, driveshaft, gear ratio, scale crawler, crawler drivetrain
Spur Gear
Plain English meaning: A larger gear in the drivetrain that meshes with the smaller pinion gear on the motor.
Why it matters: Spur gear size affects the crawler’s gearing, speed and torque. Changing spur and pinion combinations is one way to tune drivetrain performance.
Related Terms: pinion gear, gear mesh, gear ratio, transmission, crawler motor
Pinion Gear
Plain English meaning: The small gear fitted to the motor shaft.
Why it matters: The pinion gear affects speed, torque and motor load. A smaller pinion usually gives more control and torque, while a larger pinion may increase speed but can put more strain on the motor.
Related Terms: spur gear, gear mesh, gear ratio, motor upgrade, crawler drivetrain
Gear Mesh
Plain English meaning: The spacing between two gears that run together, such as the pinion and spur gear.
Why it matters: Gear mesh that is too tight can cause noise, heat and wear. Gear mesh that is too loose can strip gears. Correct gear mesh helps the crawler run smoothly and reliably.
Related Terms: pinion gear, spur gear, transmission, metal gears, crawler maintenance
Gear Ratio
Plain English meaning: The relationship between gears that affects how fast the wheels turn compared with the motor.
Why it matters: Lower gearing usually gives more torque and better low-speed control, while higher gearing gives more wheel speed. Crawlers often benefit from gearing that favours control over outright speed.
Related Terms: pinion gear, spur gear, gear reduction, wheel speed, low speed control
Gear Reduction
Plain English meaning: Gearing that reduces wheel speed while increasing torque and control.
Why it matters: Gear reduction is essential for crawling because it helps the vehicle move slowly and smoothly over obstacles. It also helps the motor control the tyres at low speed.
Related Terms: gear ratio, worm gear axle, transmission, torque, low speed control
Overdrive
Plain English meaning: A setup where the front wheels turn slightly faster than the rear wheels.
Why it matters: Overdrive can help the front tyres pull the crawler up climbs and around tight turns. It is a popular performance tuning option, but too much overdrive can make the crawler feel less natural on flat ground.
Related Terms: underdrive, gear ratio, crawler upgrades, line choice, front axle
Underdrive
Plain English meaning: A setup where one axle, usually the rear, turns slower than the other.
Why it matters: Rear underdrive can help the front of the crawler pull through turns and climbs while reducing rear push. It is often used as a tuning option alongside front overdrive.
Related Terms: overdrive, gear ratio, rear axle, crawler drivetrain, crawler tuning
Slipper Clutch
Plain English meaning: A drivetrain part designed to slip under heavy load to protect gears and other components.
Why it matters: A slipper clutch can protect the drivetrain if the tyres suddenly bind on rocks. Some crawler drivers prefer a locked-down drivetrain for maximum control, while others value the protection a slipper can provide.
Related Terms: drivetrain, gear mesh, transmission, torque, crawler maintenance
Torque Twist
Plain English meaning: The twisting movement of the chassis caused by drivetrain torque.
Why it matters: Torque twist can lift one side of the crawler and reduce stability, especially on climbs. Suspension setup, link geometry, gearing and weight placement can all affect how noticeable it is.
Related Terms: drivetrain, suspension links, gear ratio, centre of gravity, crawler setup
Backlash
Plain English meaning: Small movement or looseness between drivetrain parts before power is fully transferred.
Why it matters: A little backlash is normal, but too much can make a crawler feel sloppy and less precise. It can come from gears, driveshafts, axles or worn drivetrain parts.
Related Terms: gear mesh, transmission, driveshaft, metal gears, crawler maintenance
Suggested Next Reads
Once you understand the main vehicle terms, the next useful areas to learn are driving and skill related terms, RC crawler tools, micro crawler hop-ups, crawler wheels and tyres, and course building materials.
Vehicle Related Terms FAQ
What vehicle terms should a beginner learn first?
Beginners should start with wheelbase, ground clearance, centre of gravity, chassis, body shell, axle, suspension links, shocks, transmission, gear ratio and tyres. These terms explain most of what affects how a micro crawler looks, drives and climbs.
Why do crawler parts need to match the correct platform?
Different platforms use different dimensions, mounting points and part designs. A chassis, body, axle part or suspension link made for an SCX24 may not fit a TRX-4M or FCX24 without modification.
Which vehicle upgrades make the biggest difference to crawling performance?
The biggest improvements usually come from better tyres, lower centre of gravity, improved weight placement, stronger steering, suitable gearing and smoother suspension setup. For many micro crawlers, tyre upgrades, brass upgrades, servo upgrades and LCG chassis parts are common starting points.