Originally Posted by aeRayls

As another guy mentioned. Use a leather punch that you use to put holes in your tires. Put 2 or 3 holes in each of the inner ribs. Flipping it inside out is a huge help.

When I first got the 60mm wheels and tires I tried 3 things:

1. Stock insert nothing done to it. This was too firm for my medium grip bumpy indoor track.
2 stock insert cut. This was by far better for my conditions.

3. Open cell insert. I stuffed a 2.2 open cell insert in there. It actually doesn't feel too bad at all and gave a lot of forward bite. Unless track conditions really suck and grip is really low, I wouldn't run em.

All in all... The 2.2 just plain works better at my home track.