I was looking for a guide or mesurements between hubs and arches, to see what size wheel would fit my P9. Don't have my tape mesure, it's at work...     The wheels I was looking at are F15X7 et25 and R15X8 et0. They have plenty of clearance for calipers, not an issue. Tyres, I was thinking 195/50 & 225/45. diameter is only 3mm taller on rear tyres, but it sticks out 40mm more than fronts. Will they stick out of the guards?     Edit: Might add that between the hub of the wheel and the outside of the tyre, there's 73mm/2.9"F & 113mm/4.4"R