Christian Schneider said:ZINN and art of Bike Maintenance doesn't tell one how to discover what size clamp to be used on seat tubes. If a bike uses a 27.2 seat post, what front derailleur clamp size would it use? How is this measured? determined?
Christian Schneider said:I measured circumference to be 104mm. When I divide by pi I get 33.12..what the heck does that mean? Clamps are 31.8; 34.9...do I go with the bigger or the smaller?