The easiest way is to measure the circumference of the seat tube with a tape measure and divide by 3.14, which will give you the diameter of the front mech clamp.
There are 3 standard sizes:
9cm seat tube circumference = 28.6mm clamp
10cm seat tube circumference = 31.8mm clamp
11cm seat tube circumference = 34.9mm clamp
Easier to measure 1cm than 3mm.
here is a link to do the Math for you.
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