Hi Everyone. I'm not sure where this thread belongs, so I posted this same question in the Vintage group. I'm new here, so if that's not allowed, please tell me. Anyway, I need some help finding the right tire to fit my bike. My 40 year old OEM Rear tire is a Bridgestone 4.10-18. The rim is stamped 1.85. I think that's probably the Rim Width. My question: All the wheel/tire fitment charts I've seen say that the biggest tire you can put on a 1.85" rim is a 3.50. Why can't I use another 4.10 tire? Thanks.