Mini 4WD AT Bumpers and Slide Dampers

AT bumpers and slide dampers let the roller assembly yield on a wall impact instead of transmitting every hit into the chassis. They are handling tools for a confirmed impact problem, not automatic upgrades.

Choose the movement you need

An AT bumper pivots; a slide damper moves laterally. Both need enough controlled motion to preserve roller contact without becoming vague. Spring choice and grease affect both absorption and cornering response.

Prove the baseline first

Check roller symmetry, thrust and mounting stiffness before adding a moving bumper. Test one system at a time, especially on a course with repeatable wall contact, and confirm the modification is allowed in your class.