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30.5 clamp front mech?

GeorgymalakaGeorgymalaka Posts: 27
edited September 2014 in MTB workshop & tech

I'm rebuilding a 90's harry quinn mountain bike, made from colombus tubing, and the sachs front mech I've taken off it says it has a clamp diameter of 30.5.

I'd been hoping to replace the groupset with shimano, could I get away with using a 31.8 clamp with some sort of shim? Has anyone had any similar experience with this kind of problem?

Thanks for your help


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