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Brian's Application Notes. Notice that we have both a 20mm version and 25mm version. Obviously the 25mm version is an easier fit, but will still require fender lip roll on NA Miata (an NB with 1.5 negative camber or better typically needs no fender roll for 205/50/15 tire size). Also, the 25mm will have lower steering effort than the 20mm. Finally, please notice that the 20mm has polished lip while the 25mm is all silver powder coat with clearcoat over. Spoke shape and lip width are the same for both 20mm and 25mm (the 5mm difference is made by shaving down the pad on the back of the wheel).
Takes an optional 73mm hubcentric ring available on this website (73/54 for Miata).
MOUNTING NOTES: The Drop Center on this wheel is several inches from the top lip, making it difficult to mount stiff race tires on this rim unless you flip the wheel on the mounting machine.