How Do mecanum wheels handle the bumps?

[Chris is me]

Originally Posted by Ether

When you are pushing directly forward, the rollers are effectively locked.

All the forward torque applied to the wheel is transmitted to the carpet.

The torque is not reduced by cos(45).

The torque is not being sent straight forward at each wheel. If that were the case, mecanum drives would not have the ability to strafe.

Mecanums have the same math / efficiency setups as normal "omni" drives, with the same vector math. You'll pretty quickly figure out where 71% comes from.