The wheel rules for the TT superstock race

29.13. Carbon Fibre / composite wheels are permitted only when fitted as original equipment on the homologated machine and have been certified by the manufacturer as “Fit for purpose” for racing use on the TT mountain course. Optionally, these may be replaced by an alternative ALUMINIUM wheel from the same manufacturer or an aftermarket racing wheel supplier. In any case they must be of the same diameter and rim width as the Carbon Fibre / composite wheel they replace and weight must be no lighter than the homologated composite wheels.

Also no wheel changing during the race