I'm in the process of properly setting up my IRS and getting some QA1 12 way adjustable shock for the rear. So now I need to complete the car with some drag wheel. I have done some research on other sites and I know that the IRS will take a 15" wheel, that is if the wheel is a Centerline Telstar with a 5.5 bs, which is what I really want, and 15's up front will clear the Cobra brakes with a 1" spacer. My question is what is the proper bs for the front using the 1" spacer? The Telstars will clear the Cobra brakes in the rear also. Anyone know the bs for the front wheels with the 1" spacer?