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Stem height calculation(3 posts)

Stem height calculationChris McDonnell
May 21, 2001 8:02 AM
Does anyone know how to calculate the rise a stem will give? i.e my wife has a 9 cm long, 90 degree icon stem, her head angle is 72.5 degrees, giving 17.5 degrees of rise. I want to translate this in to mm and compare it with an 80 degree ITM millenium stem giving 7.5 degrees of rise. How much lower will the ITM be? i'm sure this is easy but it has got me stumped.

I think it is something to do with trigonometry, I remember Sin=opposite/hypotinose, Cos=Adjacent/hypotinose and Tan=opposite/adjacent, but I have no idea how to make any practical use of it!!

help

Chris
re: Stem height calculationScottV
May 21, 2001 8:19 AM
I don't know if this will help you but it might

http://www.habcycles.com/fitting.html
the formula....dave
May 21, 2001 4:29 PM
The height difference is 9 x (sin17.5 - sin7.5)= 1.53cm.

The horizontal reach will also change slightly. The 90 degree stem will have a reach that is shorter by the amount 9 x (cos7.5-cos17.5)= .34cm.