Colliers for wheels

Hi there,
I am trying to work on “sim to real” in a wheeled inverted pendulum.
The issue is that the mesh file of the cylinder in Issac gym is not a perfect round.
(Not sure why but I didn’t see such issue in Raisim simulator)
I saw a similar issue in the following link

They recommended using the custom geometry flag in Omniverse Isaac sim.
Is there something similar function in Isaac Gym as well?
Also, do you have any potential solution to make a cylinder more accurate?

I highly appreciate your help.

Thank you so much!!