Originally Posted by
JimboMartin
Brilliant Stan! Yes, if I count Pixels for the downtube near the shell vs by the derailleur I get a difference of about 9%. Pretty close to what you would expect! Thanks!!
Jim, I scaled the photo assuming the down tube was 31.7 (OS). The seat tube at the BB shell is the same (31.7) as the down tube, but at the FD clamp it slims down to 28.6. I'm convinced the bike has True Temper OS tubing with a flared seat tube at the BB shell, but taking a caliper to it will confirm.
