front mech clamp size

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youngoldbloke

The older I get, the faster I used to be ...
Measure the diameter of the seat tube?
 

jonathanw

Chorlton and the Wheelies
Location
The Frozen North
Usually it is stamped on the inside of the mech clamp if made by shimano, but as you are not keen to take off the mech then that could be tricky

31.8 standard on road bikes. There will be some extra pieces of metal inside the mech clamp to make it 28.6 if you have a smaller diameter seat tube. These can usually be seen without removing the mech.
 
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