BowDown: My standard wheels are 18" with a wheel and tire combo of just under 45lbs! I save almost 50lbs by using the smaller wheels. I also don't have the money to buy a really good set of street tires just to thrash them at an AutoX. The 15" give me a better platform to start with as I can feel pressure differences as little as 2psi.
focusownerskid: Drew ya your right it just doesn't look right without the big wheels. I did do one event this year with the 18".
The Azenis are great tires, super sticky and for so little money. I can buy 3 15's for the price of just one of my 18".
hotrodkris: So don't tell him
Just be warned it's an incredibly fun and highly addictive way to spend a sunny summers day.