Swin, I measured my GRs this a.m. and here's what I've found. The '72 has a chainstay length of 17" (43.5 cm). Both the '75s have a c/s length of 16-3/4" (42.5 cm). On all 3 the seat tube is shorter (52 cm) than the top tube (55 cm). (My '72 is pictured in a post above.) I'm running 700C wheels on the '72 and 27 x 1/14 on both '75s.
Yours appears to be somewhat newer than mine so things probably changed a lot over the model years.
Hope that bit of trivia helps.
Originally Posted by
motogeek
Hi Swin, I have 3 GRs and I'm just getting ready to crawl into bed for the nite. I'll measure each of them in the a.m. and post then.