I remember trying to increase the size of them, and when you get to about 30 m/s the stress bar reaches the maximum and they break. also i believe they werent powerful enough to accelerate on their own so i had to use rocket engines
but stress tolerance grows more than I expected
(x4 ~ 40 wheel stress on 29 m/s,
x8 ~ wheel are broken on 12 m/s).
Probably because of the cube-square law,
but maybe there is a way to add something to stats of wheels to make it more clear?
also max speed in the stat will be helpful