xer987 - I disagree with Trips over the reactive castor issue. You are on asphalt and probably have a little bit more open track to race on than the carpet races. You will not need to do snap turns around the end of a board within 12 feet. I would use the castor blocks that are not reactive castor. Reactive castor gives you an ever decreasing turning radius when you enter a corner off power. I think you need a suspension that gives you a constant, consistent turning radius on asphalt. That reactive stuff could make your car oversteer on entry. Then you are all messed up and will get excessive rear tire wear. Other than that, I agree with the .020 or .022 front springs and .063 t-bar. The degree of bumps and that will dictate the shock oil and center spring.