|Sizing and fit question||03Vortex|
Jun 26, 2003 11:40 AM
|Two bikes of identical frame size (55 measured c to t) but one has a 73 STA (and 55.5 TT) and the other has a steeper 74 STA (and 54.3 TT). Assuming of course saddle in relation to BB remains same on both, is this considered essentially the same setup? How would this effect stem length in relation to reach?
|It shouldn't however;||mainframe|
Jun 26, 2003 11:53 AM
|The HTA and HTL would technically figure in and to a lesser degree, the bar themselves. If these items are not significantly different between the bikes, stem/reach should not be an issue given the factors you provided.|
|they fit the same...||C-40|
Jun 26, 2003 6:26 PM
|The example fits a Litespeed and a Colango. Move the saddle back 1.2cm on the frame with the 74 STA and the rider will be in the same position relative to the BB and the required stem length will be the same.
The formula for figuring the difference in reach or "effective" TT length is saddle height x (cosA-cosB) plug in a 71-72cm saddle height and you will get 1.2cm. Add that amount to the TT length of the frame with the steeper STA.