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  1. #1
    Medicinal Cyclist Daytrip's Avatar
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    Brazed FD adapter?

    Can a brazed FD be adapted to fit to frame not designed to accommodate a brazed derailer? If so, is it just a clamp-on adapter?
    Let your freak flag fly.

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    Last edited by dvs cycles; 12-25-08 at 12:11 PM.

  3. #3
    Retrogrouch
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    Shimano makes a clamp-on adapter that allows their brazed FD to be mounted on a frame not designed to accommodate a brazed derailer. I don't know about other brands of FD.

  4. #4
    Medicinal Cyclist Daytrip's Avatar
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    Thanks. I'm going to be putting a Shimano 105 brazed FD on a Trek 1.2 frame. Does anybody know offhand what size tube that is?
    Let your freak flag fly.

  5. #5
    Senior Member Retro Grouch's Avatar
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    Quote Originally Posted by Daytrip View Post
    Thanks. I'm going to be putting a Shimano 105 brazed FD on a Trek 1.2 frame. Does anybody know offhand what size tube that is?
    One measurement is worth 1,000 guesses.

    Wrap a piece of paper around the seat tube. Mark where it overlaps. Measure that distance in millimeters. Divide by 3.14. That's your answer.

  6. #6
    Senior Member oldride's Avatar
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    Quote Originally Posted by Daytrip View Post
    Thanks. I'm going to be putting a Shimano 105 brazed FD on a Trek 1.2 frame. Does anybody know offhand what size tube that is?
    You could use an adjustable wrench (crescent) and open it to slide over the tube then tighten until it touches. Remove and measure the distance of the opening.

    Here is a 9sp 105 FD brazed on, clamp on, double or triple, cheap!
    http://store.icyclesusa.com/shared/S...&ProductID=103

  7. #7
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    Quote Originally Posted by J.P. View Post
    Shimano makes a clamp-on adapter that allows their brazed FD to be mounted on a frame not designed to accommodate a brazed derailer. I don't know about other brands of FD.
    Campy does too.

  8. #8
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    Here's one for 28.6 that Velo Orange sells:

    http://www.velo-orange.com/decl28.html

  9. #9
    Senior Member Deanster04's Avatar
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    Take it to your local good LBS and have them Mic the tube or pull out the seat post until you can read the diameter of the seat post. Most are scribed. I have been using the adaptors for years since I buy and sell frames over the years that have different ST diameters. Adaptors are much cheaper than the derailluers. Good luck.

  10. #10
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    For the vast majority of bikes, the seat tube OD is one of three sizes: 1-1/8" (28.6 mm), 1-1/4" (31.8 mm) or 1-3/8" (34.9 aka 35 mm). Even eyeballing a ruler should tell you which you have.

    If there was an old clamp-on fd, look inside the clamp as the diameter is usually engraved there.

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