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Need help with effective top tube calculations(2 posts)

Need help with effective top tube calculationsdawgcatchr
Aug 15, 2003 10:54 PM
I am building up a second bike, and I would like to duplicate the fit of my current ride. Here is the info: current bike: 74 degree seat tube, measured top tube of 54.3cm, running a 115mm stem. New bike: 73.5 degree seat tube, measured top tube of 53.8cm. I know there is a .6cm difference per .5 degree of seat tube variation-how does this apply? Do I subtract .6cm from the 53.8 value to get an effective top tube comparable to my current bike (that gives 53.2, meaning I would start with a 125mm stem) or is it the other way around? And why?
re: Need help with effective top tube calculationsRusty Coggs
Aug 16, 2003 5:14 AM
You may also need to consider the possibility you may move the seat forward a bit on the 73.5 frame to get the same KOP.