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Stem Question

Old 12-19-19, 09:41 AM
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smoore
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Stem Question

Guys,
I have a 90mm x8 degree stem on my Serotta and I want to try a 100mm stem. BUT don't want to increase the stem height. Lengthening the stem effectively raises the stem, correct?

So what's my best approach? I don't need the stem higher, just longer.

Thanks!
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Old 12-19-19, 10:07 AM
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17 degree stems are designed to be near horizontal for road bike typical head tube geometry. So changing to a longer stem would remain constant in height. If you like the slight upward rise of your 8 degree stem, and you want a longer one but no higher - you may have to play around with longer stems of slightly different angles.

Which direction is your 8 degree stem facing -upward or downward? A picture would be helpful here.
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Old 12-19-19, 01:03 PM
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Not a math major, but doesn't seem that 10mm diff with an 8 degree slope would be noticeable. That being said, at Jenson, saw several 100mm stems with 6 degree rise.
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Old 12-19-19, 02:11 PM
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The simplest thing would be to take out a spacer, if you have one.
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Old 12-19-19, 03:03 PM
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Originally Posted by caloso View Post
The simplest thing would be to take out a spacer, if you have one.
+1 That will stretch you out, as will the longer stem. Cheap and quick to see how you like it.
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Old 12-19-19, 03:59 PM
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You can use this stem comparison tool:

Stem Comparison Tool | yojimg.net
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Old 12-19-19, 04:15 PM
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Thanks guys, good info. I'm not too concerned about the "looks" but I just don't want to sit up any higher that already am. How can I make believe I'm in the TDF if I'm sitting up like a tourist??
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Old 12-20-19, 07:36 AM
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This question belongs in a math forum...In the trigonometry subforum.
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Old 12-20-19, 09:15 AM
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Originally Posted by Koyote View Post
This question belongs in a math forum...In the trigonometry subforum.
Or use a compass and graph paper and draw the angle of your stem extending out it's length. Then use a longer line to determine what angle the new stem needs to be to get the same height.
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Old 12-20-19, 01:46 PM
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Originally Posted by hcgaloi View Post
You can use this stem comparison tool:

Stem Comparison Tool | yojimg.net
I plugged your numbers in this tool and the 100mm stem is only 2mm higher. You could eliminate that difference with thinner bar tape.
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Old 12-20-19, 02:12 PM
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Ogsarg, compass and graph paper...should I go find my slide rule as well? Whadda think I'm old or something?

Caloso, now we're talking. Thanks for doing the math for me and I'm thinking if I replace my current bar tape with Saran Wrap...that ought do it! UDAMAN!

Thanks guys and Merry Christmas.
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