Hi all,

Bit stuck at the moment. Looking for a stem for a 25.8mm bar, there aren't many out there, certainly no choice on the used market. Thinking of getting a stem shim to go to 31.8. Are there any downsides? Any light shims about if a good idea?

Bar is lightweight carbon.

Thanks, Tim

I wouldn't if you ever pedal out of the saddle. That's too crucial a connection for extra unnecessary interfaces.

Just my two cents.

http://sheldonbrown.com/handsup.html says

If you try that, use friction paste generously.

A shim with a bigger clamp is certainly a possibility too, many people are using such a setup. The only potential problem with lightweight carbon bars is that you might not be allowed the torque to tighten things securely.

Anyway a quick google brings back quite a few results for "25.8 stem" ...

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Bikes: Raceur, Beateur