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Steer tube/stem question(4 posts)

Steer tube/stem questionken425
Jan 10, 2002 8:08 AM
I am trying to figure out if it would be safe to cut my steer tube so that it is flush with the top of my stem clamp, then at times use 3/4 inch of stack washers to raise the bar height a bit. This would leave a 3/4 inch gap between the top of the stem clamp and the top of the steer tube. Is this safe?

I want to do this so that I can lower my bars for triathlons and time trials (in order to get my aerobar rests where they should be) but then raise the bars again to go back to my road position. I know I could just buy 2 stems, but it is a pain to swap out stems all the time if I don't have to.

It is a 1 inch threadless stem, if that makes any difference.

Thanks for your help.
Jan 10, 2002 9:33 AM
The only safe way to use spacers for adjusting bar height is to cut the steering tube to the proper length with the additional spacers below the stem. When you want to lower the stem, the spacers are removed and placed on top of the stem. Yes it looks dumb, but it's the only safe way to do this. The top of the steering tube should not be more than a few milimeters below the top of the stem.

The other alternative is to purchase a stem with an angle that would provide a different height when it is flipped upside down. An 80 degree stem flipped to 100 degrees will raise the bars about 36mm or 1-3/8 inches, but also reduces the reach by about 10mm. An 84 degree stem like a Ritchey WCS flipped to 96 degrees would raise the bars about 23mm or almost 7/8 inch. The reach would be about 7mm shorter when flipped.
Jan 10, 2002 10:13 AM
The other alternative is to buy the threadless version of the ergostem. You can then adjust bar height and reach depending on your needs with just a couple twists of a hex wrench.

As above DO NOT improperly clamp stem onto steerer to vary height, it's mucho unsafe.
Jan 11, 2002 6:22 AM
C40 is absolutely right! All you have to do is normal riding with the spacers below the stem. Time trialing with the spacers on top of the stem.
RIDE on!