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Bruce Peck

38″ is good.  36″ is a better goal using the 36.5″ New Concept nose if you can find one.  L-4 and/or L-3 as others have stated is the best place to start for pipe.  I highly recommend the Hoosiers in the R60 compound and the 4.5/10.5-6 size on all four corners.  That tire set up is what won the WKA sprint class on day 2 at Daytona last month (he wasn’t running Yamaha though).   You don’t really need the wider tire on the rear unless your chassis is just really hard on tires.