When using Physics Wheels (not Raycast Wheels), you must pay careful attention to the shape of the collision on your wheel mesh. AVS supports any collision shape, but for best results—especially at high speeds—you should use a simple sphere collision.

Unreal Engine does not support true cylinder collisions in Chaos.
Faking a cylinder using convex collision may look correct, but it will not behave correctly—these approximated shapes are not perfectly round, and they will cause the wheels to bounce or behave erratically when driving fast.

While unconventional setups are allowed, a sphere is the most stable and recommended option for typical vehicles using physics-based wheels.

Raycast Wheels are not affected by this limitation. You can use any collision shape for them, since the collision shape does not influence their simulation behavior.

If you're using a Skeletal Mesh as part of your vehicle setup and need to add physics constraints, do not place those constraints inside the mesh’s Physics Asset—especially if they rely on the skeletal mesh’s root body.

Instead, create all such constraints directly in the vehicle blueprint, and connect them to the VehicleMesh component (the AVS root). This avoids a class of difficult-to-debug issues where constraints behave erratically—typically showing stuttery or jittery motion in parts of the mesh that are meant to simulate.

This behavior stems from how Unreal updates transforms for components that aren’t welded to the root. Constraints defined inside skeletal mesh assets may receive outdated transform data, especially when mixing simulated and non-simulated bodies. The result is inconsistent, unstable physics behavior, usually visible as violent jittering of constrained parts.

To prevent this entirely, set up all physics constraints externally in your vehicle blueprint where they can reference the true root of the simulation.

A demonstration of this issue can be seen in the video to the right.