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Math help - 84* versus 90* stem(6 posts)

Math help - 84* versus 90* stemBerm
May 2, 2003 1:19 PM
I need a new stem in a 110mm length. Can anyone calculate the difference in bar height between going with a 84* stem and a 90* stem? To even be more technical, I am currently running a 100mm stem at 90* and want to go with a 110mm stem. How will the extra length affect the ultimate height in these two rises?

I should have paid more attention in math while in school because there is no way I can figure this out short of buying both stems, mounting them and measuring.
http://www.habcycles.com/fitting.html (nm)geeker
May 2, 2003 1:31 PM
adults only (nm)gcbgcb
May 2, 2003 2:29 PM
re: Math help - 84* versus 90* stemB2
May 2, 2003 10:05 PM
Using 100 x 90 degree as a starting point your bar position will change as follows:

110 x 90 degree = +0.95cm horiz and +0.31cm vert
110 x 84 degree = +1.25cm horiz and -0.80cm vert

Bryan
re: Math help - 84* versus 90* stemBerm
May 3, 2003 6:43 AM
Thanks for the help.
re: Math help - 84* versus 90* stemDr_Octalink
May 2, 2003 10:11 PM
stem angle charts are available. If you use a 90deg stem you will meerly gain 1 cm in cocpit length. a 110 84deg (-6 deg rise)will give you a small decrease in bar height ( a bit less than 1cm) causing the bike to "feel" even longer. This will increase your "differential" could cause additional hand pressure or lower back stress. or on the other hand if you can handle the extra "drop" (flexibility wise) this change can result in more power and or less fatigue. often 84 deg stems can be inverted to allow extra height and will shorten cocpit by about 1/2 cm.