Don't know if this would help but i have a 1974 12 speed Raliegh GranPrix 25 1/2 inch frame with all Suntour drive train, 27 1/4, 36 spoke rims with Suntour barend shifters. This is an extra large frame that i picked up a couple of years ago from a man who was 6 feet 6 inches high. It has all quality parts. Fatter tires and you would be good to go. I bought it for the bar end shifters only but never got around to taking them off.