[thefro526]

In my understanding (in no way am I an expert) When you decrease the mass of an object and the force stays the same said object takes less time to spin up to speed and i think because less force is need to spin said object it is transfered to the drive or what ever.

when I built a vex shooter a while back I had 3 motors using a 1:49 gear ratio which had theoretical rpm of 4900. I hit no where near that. But originally i used normal 2.75 inch wheels with rubber on them. They took super long to spin up to speed, but when i replaced thouse wheels with omnis they took much less to spin up to speed and also may have spun a bit faster.

hope this helps,
Dustin