Wheel class isn't working

I don’t know why but when i set the wheel class in the wheeled component he doesn’t work, i see no collision ,so the wheels go through the ground.I try to rig again and again my mesh and reimport again and again but nothing change.

Are you using SimpleVehicle component for 6W?

I use the wheeled vehicle movement component

My wheels go troughs the floor too :frowning:

Worked on 4 wheeled vehicule

I deleted 4 wheels and now it work !