Originally Posted by
zs3889
I just started looking into Serotta bikes and potentially finding a frame for a project. Is the CSI just a newer Colorado? Just like CIII = Colorado III? I find the names to be a little confusing (CRL, CIII, TG, LT).
I really don’t know, I want to say the CSi has proprietary tubing that has more shaping to it. Honestly I’m not even sure if that tubing was special made for Serotta by Columbus or Ishiwata or whoever. I hope to learn something so I will stay tuned to this thread. Also, of the used CSi’s that I see up for sale, almost all of these seem to be “custom” geometry for the original purchaser. I see ones with extra short top tubes, head tube extenders, for example.