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stem height question(2 posts)

stem height questionmollythedog
Feb 1, 2004 7:33 AM
I just replaced the Thomson stem (120 -10 degrees) with a Deda newton (120 and -8 degrees) The bike has 20mm of spacers. How does the 2 degrees of diff. result in stem height. My question is how many mill. of spacers should I add or remove to make the position the same?
bars will be 4mm higher...C-40
Feb 1, 2004 7:46 AM
The bars will be 4mm higher due to the reduced angle, but there will usually be a difference in the stem clamp length to contend with also. I would suspect that the Newton stem has a shorter stem clamp height. Measure the difference and take that into account.

The simple method would have been to take a measurement of the bar height from the floor to the top of the bars wiht the old stem, then put on the new stem, take the same measurement, and adjust accordingly.

Personally, If I had to use 2cm of spacer, I would have purchased a stem with a different angle. An 84 degree stem (like Ritchey), flipped over to 96 degreees would raise the bars 2cm and eliminate all the spacers.