So I have a few questions. My bike is an 82 heritage special sj. Front tire is 3.00-18 and my rear is a 4/60 s16. I know that the rear translates to a 120/90 s16 but im not sure if the front is 90/90 18 or if I can use a 3.25-18 and have that fit properly with no rubbing. I am keeping the front...