Hi, all. I am new to XSs, have been working on pre-AMF H-D (1950) for a while. I just picked up a 1977 XS650D and am pretty stoked. It is currently running an 4.75 tire on an 18 x 2.15 rim on the back and about a 4.00 on a 19 on the front. I am going the opposite direction of most on this forum...