Measuring for Mechs

mrkawasaki

Retrobike Rider
Bought some sexy vernier calipers to measure various bits of bicycle tubing and am now unsure about how I find the measurement for a front mech - is it the internal (post) size or the external tube diameter?

:?

Neil
 
:D
if you have a mech on it, the older ones have the measurment (28.6 31.8 34.9) on the inside of the clamp. The later ones have them (if I'm not mistaken on the outside.
 
or just measure the outer diameter and see if it is a measurement you would recognise (i.e one of the standard sizes) ;)
 
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