Are you sure you're not getting shot at and your wheels being hit ?
Also, make sure you don't hit rocks or other obstacles on the ground that may damage (flatten) your wheels.

One of the very first thing i did with a friend was racing around the whole stratis island and it was just fine !

Please let us know in note section if you are still able to reproduce this issue in latest Developement build.

Some shit with geo lod of wheels, I think vertexes is not merged

Closing due to lack of feedback. If this issue is still reproducable for you, please create a new ticket for it or ask for this one to be re-opened.