P1 Racing SF Challenge wheels are the same wheels as the P1 Racing SF but are offered with different color variations. When every ounce counts, the P1 Racing SF does not disappoint with its light weight design. In the same lineage of the legendary forged P1 Racing QF Wheel, the SF continues in the same manner, offering lightweight quality and high-performance. The P1 Racing SF wheel is a perfect strike of style and performance while making it durable enough for both track and street duties.