Space out your wheels without adding heavy wheel spacers. Weltmeister engineered turbo star spacers reduce wheel inertia to improve suspension response. They are 40% lighter than heavy solid spacers and over 10% lighter than factory spacers (they also cost 25% to 50% less). Computer tests show turbo star spacer design is safe against deformation at greater than 7g cornering load! These strong 6061-t6 aluminum spacers come in three widths and require longer wheel studs. 21mm spacers require 66mm wheel studs; 27mm spacers require 72mm studs; 54mm spacers require 100mm studs. will not fit front hubs on 928, 944, and 968.