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spacers and seatposts and wheels, oh my(7 posts)

spacers and seatposts and wheels, oh mymt_biker
Apr 8, 2003 5:23 AM
I'm building my first cx bike and I'd like your input.

First, what's all the controversy over headset spacers? It looks like I'm going to need about 5cm of spacers to get the bars in the right relation to the seat. Is this an issue?

Second, what's the difference between road and mountain seatposts? Which do you use in cyclocross?

The frame I'm building has 135mm rear spacing. I am planning on using an ultegra rear hub (130mm). Any problems? Should I cold set the frame down to 130mm? It is steel.

Thanks for all your help,
Montana biker
re: spacers and seatposts and wheels, oh myMitch2
Apr 8, 2003 6:05 AM
Well I have little bit over an inch of spacers and no problems on my cross bike and that's w/ a 15 degree stem(I have loong legs)

I currently use a mtb style post because it is longer than a regular road post. Other than that a road post is slightly lighter.

W/ the rear spacing I tried using a 130 on a 135 spaced frame and that did not work for me. I had the bikeshop install a longer axle to fit the 135 spacing.
re: spacers and seatposts and wheels, oh mymt_biker
Apr 8, 2003 6:12 AM
"I had the bikeshop install a longer axle to fit the 135 spacing"

Good idea. Did they put some kind of 5mm spacer behind the lock nut? Perhaps 2, 2.5mm spacers to keep the wheel centered?

Thanks for the feedback.
I believe that you will have to space the left side only…TFerguson
Apr 8, 2003 10:42 AM
(I am assuming you are not talking SS of Fixed.)

You need to keep the cassette where it is which precludes spacing the right side. The wheel will have to be re-dished. Moving it 2.5 mm is no big deal.

TF
headset spacers...atpjunkie
Apr 8, 2003 11:37 AM
only an issue with carbon steer tubes. If you are using alloy or ti not a problem. If using carbon (yikes) don't go over 2.5-3 mm for 1" and no more than 5mm on 1.125". (Unless you are light) wider cx bars, torque from hammering and dirt abuse will kill a carbon steer tube with too much stack exposure.
I believe that you will have to space the left side only…mt_biker
Apr 8, 2003 12:29 PM
Makes sense. Wouldn't this actually make the wheel stronger by pulling the rim more towards the center of the hub?
Anything specific I should use for a spacer or will an aluminum bushing that fits over the axle be fine?

Thanks again for your help.
I'm already enjoying this new aspect of cycling and I haven't even built the bike yet.
Stronger is why MTB spacing is wider...TFerguson
Apr 8, 2003 5:03 PM
Yes, an Al bushing that fits the axle will work fine. Put it between the lock nut and whatever spacer is in there now.
TF