RC Car Chassis Types: Plate, Tub, Ladder and Tube Frames Explained
The chassis is the backbone that holds an RC car’s suspension, drivetrain, electronics and battery. Four main types are used: flat plate chassis (aluminium or carbon, common on racing buggies and touring cars), tub chassis (moulded plastic, common on bashers and short-course trucks), ladder frames (two rails, used on crawlers and scale trucks) and tube or space frames (welded or bolted tubes, used on rock bouncers, sand rails and some scale builds). The right one depends on how you drive.
By Kyle HilsonUpdated: October 20264 min read
Chassis types
| Type | Material | Strengths | Typical use |
|---|---|---|---|
| Flat plate | Aluminium, carbon | Low CG, tunable flex | Racing buggies, touring cars |
| Tub | Moulded composite | Tough, protects electronics | Bashers, short-course trucks |
| Ladder frame | Steel, aluminium rails | Scale look, strong, simple | Crawlers, scale trucks |
| Tube / space frame | Steel or aluminium tubes | Strong, open, scale | Rock bouncers, sand rails |
Stiffness and flex
Chassis flex changes handling. A stiffer chassis responds faster and suits high-grip surfaces; some flex helps on bumpy or low-grip tracks because it lets the tyres keep contact. Racers tune flex with chassis braces, different plate thicknesses and top decks. For bashing, stiffness and toughness matter more than fine tuning.
Choosing for your driving
- Racing: flat plate with adjustable braces.
- Bashing and jumps: tub chassis that protects electronics.
- Crawling and trail: ladder frame with solid axles.
- Scale off-road builds: tube frame or ladder frame.
- Backyard custom: simple plate or ladder frame, easy to make.
Designing your own
- Choose the scale and wheelbase first (for example a 313 mm wheelbase is common for 1/10 crawlers; 1/24 chassis are much smaller).
- Plan where the battery, ESC and receiver go for a low, central weight.
- Design mounts for the suspension and drivetrain you’ll use.
- Prototype in plywood, 3D-printed plastic or thin aluminium.
- Test, then make the final version in stronger material.
Step-by-step frame building is covered in how to build an RC car frame.
Materials
Aluminium is easy to work, strong and affordable. Carbon fibre is light and stiff but can splinter and must be sealed at edges. Composite (glass-filled nylon) tubs absorb impacts. Steel ladder rails are heavy, which helps crawlers keep a low centre of gravity. 3D-printed chassis work for small or prototype builds, with PETG or nylon more durable than PLA.
Kits and upgrades
Many kits offer upgrade chassis plates in aluminium or carbon. Upgrades change weight and flex, so they help racers who know what they want but don’t automatically make a car better. Kits are covered in buildable RC cars.
Chassis checklist
- Low and central weight placement.
- Strong mounts for suspension and motor.
- Protection for electronics.
- Easy battery access.
- Room for cooling airflow.
Weight distribution
Where the weight sits matters as much as the chassis type. A low, central battery position improves handling and reduces rollovers. Rear-biased weight helps traction on 2WD cars; front weight helps steering bite. Crawlers often add weight low on the axles to stay planted on climbs. When building or modifying a chassis, plan the heavy parts first: battery, motor and ESC.
Repairs and durability
Plate chassis can bend in big crashes; a bent plate makes the car pull to one side and should be replaced. Tub chassis crack around mounting points; reinforce or replace them. Ladder frames rarely break but can twist; check them on a flat surface. Regular inspections catch damage early.
FAQ
What is the best RC car chassis?
It depends on use: plate for racing, tub for bashing, ladder for crawling.
Is carbon better than aluminium?
Lighter and stiffer, but more expensive and less forgiving in crashes.
Can I 3D-print a chassis?
Yes, for small or prototype builds.
What chassis for a backyard car?
A tough tub or a simple ladder frame.
More on this topic: the complete RC Cars guide covers the basics behind this article.
About 20 years in RC. Mostly boats in the NAVIGA Mini Eco Expert class, with many self-made parts; also a King Motor Baja 5B, a home-built electric plane, home-built nitro planes he has flown, and an RC helicopter. More about SwellRC
