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  1. #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?

  2. #2
    Senior Member Retro Grouch's Avatar
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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.

  3. #3
    One less car Jay H's Avatar
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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

  4. #4
    rj987652003
    Guest
    THanks for your help. Both of you guys gave me good ideas. MUch appreciation.

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