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  1. #1
    Bike nerd
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    Bottom bracket shell backwards....what are my options?

    Near the end of my first bamboo frame build and I just discovered I made a complete newb mistake, I installed the BB shell backwards! I was planning on using a Sug 103mm BB and with it installed backwards the chainring is too close to the CS so not an option. I might be able to use a 110mm. I could always grind the joint down and try to flip it. Left side drive? Backward drive? Is there any option I'm not thinking of? This sucks, I've put a lot of hours into this frame, I have to make it work....

    Joe

  2. #2
    I'm band already? lubes17319's Avatar
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    I have the same problem on a recent acquisition. Came from NOVA threaded backwards, on a lugged shell.
    I flipped the BB around, but do put some blue LocTite on or else you'll be stopping to re-tighten the cups. (had this happen on 1st long test ride)

    Test out a few BB spindle lengths to see what fits.
    Who cares what your bike weighs, just ride it!

  3. #3
    Senior Member
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    To the Op, always you can put a spacer at the driver side, this way u will get the clearance needed maybe?. The lbs for sure can spare you one, they come standar in all shimano MTB cranksets and usually aren't used.

  4. #4
    Framebuilder
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    Another option:
    http://store.velo-orange.com/index.p...-brackets.html
    not cheap, but it would be reusable.

  5. #5
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    Wow thats an awesome solution, and even in 103? extra wows.

    Wonder if posible to take the axle of the other models and move it to this unit, the darn axle is pretty ugly, sadly is only jis
    Last edited by ultraman6970; 10-24-10 at 04:54 PM.

  6. #6
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    You may be able to just use a smaller chainring in front to get a hair more clearance.

  7. #7
    Bike nerd
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    Thanks for all the replies.

    I don't think a BB spacer would help me. As far as I know, spacers are meant to be used on the fixed cup side which for me is on the wrong side. Am I missing something?

    I think I'm going to either try a longer BB spindle or give a threadless BB a try. I measured the left side of a 113 that I have installed on one of my steel frames and it's a bit longer than the right side of the 103 so I think the left side of a 110 would be just about the same as the right side of a 103.

  8. #8
    Senior Member RoboMonkey's Avatar
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    We don't get a picture of your frame?

  9. #9
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    the VO threadless bottom bracket's axle is keyed for a circlip to hold bearings in place... Swapping could be a complicated task.

  10. #10
    Junior Member
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    Is it English thread? If so have it re-cut Italian. The diameter will be just enough larger that you will have not a perfect, but very adequate thread.

  11. #11
    Bike nerd
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    I ended up going with a 110MM bottom bracket, installed backwards, which ended up being the same exact clearance on the drive side as a 103MM installed correctly. Works perfectly. Here are a few pictures of the project in process.... Bamboo Bike Album

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