Bicycle Mechanics - I meant what size FD clamp?
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11-15-10, 08:36 PM
What size FD clamp do I need for my 2011 Trek Madone 4.7?
11-15-10, 08:39 PM
what diameter is your seat tube?, measure and know.
Quote another thread :
you can measure it fairly accurately, at least to get into the right ballpark, by wrapping a strip tightly 3 times around on a slight spiral. Draw a line across all the layers, then unwind and measure. Divide the measurement by the number of turns, then by 3.14 to get the diameter. If you measured in inches multiply by 25.4 to get the mm size.
Of course if you take the seatpost out you can lay a ruler across the open end.
it's either 31.9 or 34.9.
11-15-10, 08:53 PM
The three diameter choices in circular clamps are 1-1/8" (28.6 mm), 1-1/4" (31.8 mm) or 1-3/8" (34.9 mm). Since 1-1/8 is pretty much limited to steel frames, your Trek is one of the larger two, most likely 1-3/8"/35.9 mm.
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