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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 09-30-04, 03:44 AM   #1
rj987652003
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28.6mm vs. 31.8mm front derailleur?

I've got a steel bike- My question is a 28.6mm clamp front derailleur typically for a steek bike?
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Old 09-30-04, 04:05 AM   #2
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Well, you have to match whatever the frame of the bike is. One measurement is sometimes worth 1,000 guesses. If you don't have a caliper, wrap a piece of paper around the seat tube, mark where they meet, measure in millimeters and divide by 3.14. As a general rule, I'd say that you are most likely to find a 28.6 seat tube on a steel framed bike.
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Old 09-30-04, 05:45 AM   #3
Jay H
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Do you already have a clamp-on FD for your steel bike? If you take the clamp off, sometimes if you clean it well enough, the diameter is stamped on there which you can read.

Otherwise the Diameter= Circumference/Pi works as described above.

Jay
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Old 09-30-04, 03:49 PM   #4
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THanks for your help. Both of you guys gave me good ideas. MUch appreciation.
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