Well I think you just answered the questions needed to put the gearing equation together. I will look at the link you mentioned and continue with the information you have given. I will email you with my findings. Your level of insight is extremely valuable. Thanks Grigg. By the way I did see couple of roadrangers on ebay: 9 and 10 speeds but the prefixes varied. I guess newer models but I will email you unless you would rather keep posting for the benefit of other bolters.
