Getting the quad setup for racing and have a few questions for you guys.(new to TT stuff)

1. What width rim should I run in the rear for a 19x10x10 tire(American Racer)8...9...10?

2. I assume a 5" rim is used for the front 18X6x10???

3. Also is it OK to just back off the preload on the rear shock to lower the ride height or should I have the shock travel shortened to limit excessive down travel(no-link)?

4. I was planning on just running shorter shocks on the front with long travel arms. Is that the normal way of going about it?

Thanks much, Stephen.