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Calculating stem rise. Need help please.(4 posts)

Calculating stem rise. Need help please.SeamusAD
May 17, 2003 7:00 PM
My current stem, which came with the bike, is a little more than horizontal to the ground. In other words, it rises slightly above the horizontal plane.If my head tube angle is 73, then is my stem rise > 17 degrees?

I ask because I need to purchase a stem that places me in a slightly more upright position(shoulder injury). Flipping the stem is not an option; I already own a mountain bike. I am confused by the different measure ments given for stems. For example, is there a difference between -10 and 80 degrees? Where is the point of departure for such measurements?

My hope is that I can determine the rise of my current stem and then order an appropriate replacement. Thanks for your help.
Quick and Dirty Method...Akirasho
May 17, 2003 7:59 PM

Be the bike.
what brand?C-40
May 18, 2003 5:21 AM
There are so many stems with nearly identical angles, it's unlikely that you can measure the difference between an 80, 82 or 84 degree stem. These are the common angles that will produce only small increases in height.

An 80 degree stem is the same as a -10 and a 73 is the same as a -17. The 73 stem will be horizontal, the 80 will have a 7 degree rise from the horizontal, the 82 a 9 degree rise and the 84 an 11 degree rise.

Why is flipping the stem not an option? An 84 degree Ritchey produces a 96 degree angle and raises the bars slightly less than 2cm. If you have some spacers on the steering tube, flipping the stem and adjusting the amount of spacers will allow you to fine tune the height.
what brand?SeamusAD
May 18, 2003 10:28 AM
I don't know what brand of stem it is. It is a stock Bianchi stem; I can't dtermine the manufacturer.

Flipping this stem gives me more rise than I would like. Further, I dislike the way it looks. Yes, my bike's appearance really does matter.