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Carbon steer tubes and fat boys...(3 posts)

Carbon steer tubes and fat boys...jaybird
Sep 14, 2001 11:46 AM
OK, here's the deal, I am looking to upgrade the fork son one of my bikes to a Reynolds Ouzo Pro with a carbon steer tube and one guy at a lbs told me that people over 200lbs should not use a fork with a carbon steer tube? What gives? I am a big guy at 6'3" 220 and I have a fairly strong uppper body from swimming but I am pretty sure I have seen larger riders than me with this fork...
re: Carbon steer tubes and fat boys...Akirasho
Sep 14, 2001 12:59 PM
... more of a concern would be your headtube length and needed stem height...

Carbon fiber steerers cannot be spaced as much as alloy ones... My 1" Pro Aero instructions call for two spacers... but total stack height with spacers cannot exceed 1" (1 1/2" on 1 1/8" steerer).

The other concern if flex (especially on the 1" unit). I suspect that it would depend on your application. I use mine on a couple of TT bikes and as such, flex is not a concern... A larger rider who used the fork for hard cornering crits or power sprints "might" feel different (I do neither).

With respect to failure, I doubt that your weight would be a concern (I'm a bit more than you) for a properly installed fork under "average" riding conditions.

If your position is not adversely effected, and/or you can get a proper stem height position given the abovementioned constraints, then go for it... my Pro Aeros are quite sweet.

We abide.

Remain In Light.
minimize spacers...C-40
Sep 16, 2001 5:14 AM
As long as you don't use more than 1cm of steering tube spacer there shouldn't be a problem. If you need more bar height, it would be better to use a 90 degree stem, or flip an 80 degree stem to get a 100 degree angle, and get rid of the spacers completely.

Some pro mechanics recommend cutting the steering tube slightly taller than the top of the stem and placing a 2-3mm spacer under the top cap, to decrease the chance of stem clamping pressure cracking the steering tube. Don't go crazy tightening the stem clamping bolts. It really doesn't take much torque to keep the stem in place. The small 5mm bolts used on most stems should only be torqued to 5-6 foot-pounds.

For someone of your weight, the minor weight reduction of a carbon steerer isn't very important. Using a steel tube would be cheaper and eliminate your worries.