Wheel Controller 3D
If you are looking for a complete vehicle physics package with WC3D included, check out NWH Vehicle Physics.
For setup instructions click here or see the Setup Guide.
Wheel Controller 3D is a complete alternative to the Unity’s inbuilt wheel collider. It allows for more realistic vehicle behavior, complete customization and 3D ground detection. No more “stick” wheels!

Features:
- Wheel has width and length, not only a single point in the middle.
- API with almost no differences from Unity's inbuilt WheelCollider - familiar and easily swappable.
- Fully customizable via custom inspector. Adjust spring, damper, friction curves, geometry, etc.
- Adjustable camber, caster and rim offset.
- Pacejka friction model with support for different surfaces.
- Friction preset system that uses ScriptableObjects for easy surface switching.
- High-frequency substepping - runs wheel physics at up to 200Hz for improved stability.
- Anti-roll bar (ARB) system - per-axle roll stiffness for handling tuning.
- Static friction system - prevents low-speed jitter and enables stable parking on slopes.
- Per-wheel ABS/TCS - integrated stability control for anti-lock braking and traction control.
- Force feedback support - aligning moment and tire scrub data for steering wheel integration.
- Adjustable at runtime.
- Adjustable ground detection resolution with multi-threading for very low performance impact.
- Can handle wheel visuals by itself (rotation and position).
- Suitable for different kinds of vehicles: cars, trucks, motorcycles, tanks, etc.
- 0.03 ms of CPU time per frame for an average wheel.
- Easy to set up.
- C# source code included.
Try it out:
More info:
Buy WheelController3D: Unity Asset Store