13x5.5 is as narrow as we do at Superlite, most guys are runing atleast 5.5", because 5" in new wheels are getting near impossible t find in a good racing wheel. The SCCA H-production cars, not long ago got a rule change allowing them to run 6" wide wheels, so there may be some used wheels avaialable from the HP racers, a visit to the SCCA prod website might be worth it to find 5" wheels. If you go with the 5.5 (which it the better move as fr fitting ood race rubber), we have the Superlite GTR race wheels now. Give me a shout I work for VTO, and have from the begining of the Superlites and am their East coast distributor, now a good time to buy GTR, as there is going to be price increase real soon. FWIW, we are now the proud sponsor of 4 time SCCA HP champion Tom Feller, I put that deal together for VTO and Superlite. Nice Healey Doug.