Just wondering if there is a rule for test & tune night at the dragstrip to use them or not on drag radials? I have Weld Prostars 15x8 with a 5.5 back spacing and needed a 7/32 spacer to clear my rear brake calipers. What about when competeing at a national event like Ford World Challenge?
Most do not have an actual "rule" on spacers. As long as there is enough thread for the lug nut to use properly and the spacers are a one piece design it should pass tech.