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  1. #1
    Blue Light Special kmart's Avatar
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    Mounting cable guides on odd DT shifter bosses?

    I have an '86 Centurion Dave Scott Ironman bike that I want to fit with modern Shimano STI stuff. Unfortunately I don't know how to fit my 9speed Shimano STI group on the frame: I took off the downtube shifters and discovered that the shifter bosses are not the usual "square" shape, so I can't fit STI cable bosses like these:


    They have a semi-round shape and a notch that serves as a limit stop for downtube shifters (currently I have Shimano 600 friction shifters mounted). The cable guides above will not fit these bosses.

    How can I get my STI cables on the DT shifter braze ons? Note, I'd rather not use a clamp-on cable guide. The naked braze-ons would get in the way of the cable and even if they didn't it would look ugly.
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  2. #2
    Senior Member
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    Can you file or Dremel the bosses to match the cable stops? All you really need is an M5x.8 threaded hole in the bosses to fasten the stops as long as they will fit over the bosses.

  3. #3
    Senior Member melville's Avatar
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    Quote Originally Posted by kmart View Post
    I have an '86 Centurion Dave Scott Ironman bike that I want to fit with modern Shimano STI stuff. Unfortunately I don't know how to fit my 9speed Shimano STI group on the frame: I took off the downtube shifters and discovered that the shifter bosses are not the usual "square" shape, so I can't fit STI cable bosses...

    They have a semi-round shape and a notch that serves as a limit stop for downtube shifters (currently I have Shimano 600 friction shifters mounted). The cable guides above will not fit these bosses.

    How can I get my STI cables on the DT shifter braze ons? Note, I'd rather not use a clamp-on cable guide. The naked braze-ons would get in the way of the cable and even if they didn't it would look ugly.
    IIRC you can file a notch in the STI cable stops as needed to make it go. You most likely will reuse the wingnuts from your friction shifters to hold the stops, as I dimly recall that Shimano used a 4.5mm screw in their proprietary braze-on, and not the 5mm screw you have with your cable stop set. Good luck and report back!

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