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I have a 1991 Klein Quantum and I want to upgrade the entire group set. Does anybody know what is the clamp size I need? I measured the circumference using a string and a ruler and came with 11.5 cm but in an online store it gives me the options: braze on, 32mm and 35mm clamp. How do you measure the size if I'm doing it wrong?
 

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11.5cm divided by pi gives you a diameter of about 36.6mm.
 
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