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  1. #1
    meb
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    Alternative BB cable guide mounting techniques vs. the traditional screw/rivet

    I was wanting to replace a destroyed bottom bracket with an internal gear bottom bracket in my Bridgestone MB-4 mountain bike. The internal gear bottom bracket takes up the entire diameter of the shell so the screw mounting the cable runs protrudes into the shell blocking insertion. As this was an early mountain bike, it has a bottom pull FD and the canti brakes are on the chainstays. So if I make a less than secure attachment of the cable runs we may have a braking safety issue.

    Any alternatives on how to mount the chainstays on this frame?

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    Senior member Dan Burkhart's Avatar
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    Quote Originally Posted by meb View Post
    I was wanting to replace a destroyed bottom bracket with an internal gear bottom bracket in my Bridgestone MB-4 mountain bike. The internal gear bottom bracket takes up the entire diameter of the shell so the screw mounting the cable runs protrudes into the shell blocking insertion. As this was an early mountain bike, it has a bottom pull FD and the canti brakes are on the chainstays. So if I make a less than secure attachment of the cable runs we may have a braking safety issue.

    Any alternatives on how to mount the chainstays on this frame?
    Any part of the screw that extends into the shell is superfluous anyway. Dremmel it down flush with the surface. I've done it with no ill effects.

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    Quote Originally Posted by Dan Burkhart View Post
    Any part of the screw that extends into the shell is superfluous anyway. Dremmel it down flush with the surface. I've done it with no ill effects.
    +1. Trim the screw and/or superglue.

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    biked well well biked's Avatar
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    Yep, shorter screw or use a small washer or two under the head of the screw so it doesn't protrude into the shell.

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    Senior member Dan Burkhart's Avatar
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    BTW, which internal gear bb. Schlumpf, FSA, Hammerschmidt?

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    You are getting rid of the FD right? For the rear brake, you could replace with V brakes and no more need for a cable stop (though that means new lever too)

    But are you going toward full internal gearing? Then you can get a rear hub with integrated drum brake :-)

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    Senior Member brockd15's Avatar
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    Or you could use a clamp-on cable guide (the 2nd & 3rd pictures are from (http://www.phred.org/~alex/bikes/trekroad.html).






  8. #8
    meb
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    Quote Originally Posted by Dan Burkhart View Post
    BTW, which internal gear bb. Schlumpf, FSA, Hammerschmidt?
    SuperGear-they are now out of business.

  9. #9
    meb
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    Quote Originally Posted by larry_llama View Post
    You are getting rid of the FD right? For the rear brake, you could replace with V brakes and no more need for a cable stop (though that means new lever too)

    But are you going toward full internal gearing? Then you can get a rear hub with integrated drum brake :-)
    It's a triple ring 2 speed internal gear BB. Was planning on keeping the triple FDer unitl I discovered these things will accept a ringed crank outboard the triple (just put a single or double crank on its square taper bottom bracket) so if I find a FDer with enough throw I can turn this into a quadruple or quintuple crank plus 2 speed internal gear on the 3 smallest rings and become king of overkill and would substitute the FDer accordingly. The low gear is only 20% lower than direct drive so still prefer a triple, particularly since this bike has a Turner AWD system on it.

  10. #10
    meb
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    That might be doable. My cables go underneath the shell but I think one could reroute cables with a little effort and get that to work.

  11. #11
    Senior Member SlimAgainSoon's Avatar
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    Glue.

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    Senior Member Steev's Avatar
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    How small is the clearance inside the shell? Could you use a machine screw with the head on the inside of the shell and secure with a nut on the outside?

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    I agree. Today's special adhesives are strong enough, I believe. The cable guide shouldn't move or shift off position with the (I think) minor friction of a moving cable.

  14. #14
    meb
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    Quote Originally Posted by well biked View Post
    Yep, shorter screw or use a small washer or two under the head of the screw so it doesn't protrude into the shell.
    If the washer approach is employed, would lock washers work better than flat washers? Any idea what the i.d. of the washer should be to go around those screw?

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    Senior Member DannoXYZ's Avatar
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    Be careful as these screws tend to be tapered sheet-metal screws. If you back them out with washers, they won't grip as tightly and may wiggle loose. I would go with grinding down the tip so that you'd have the fat base of the screw in the BB-shell rather than the tip.

    If however, your BB is actually tapped for machine-screw threads, then the bolt most likely would be 5x0.8mm or 6x1mm. In which case, washers would work. Measure the bolt with calipers to determine which it is.

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    biked well well biked's Avatar
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    Quote Originally Posted by meb View Post
    If the washer approach is employed, would lock washers work better than flat washers? Any idea what the i.d. of the washer should be to go around those screw?
    You're just taking up space with the washers, it shouldn't matter.

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