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  1. #1
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    9/10 speed groupset on 80's 531c Road Frame w/weird BB shell

    Hi there

    As a preamble, I've read a lot of forum posts about groupsets etc and haven't quite found the answer - also my frame is a bit eccentric hence this post...

    So, basically I'm wanting to install a modern-ish groupset on my '85 Bob Jackson road frame...which is currently running single-speed.

    Got a few questions. Obviously I know it's easier to buy a whole groupset so everything works perfectly but there's always that cash flow problem!

    There's also a funny thing with my bottom bracket- it's 65mm wide...Obviously it must have been 68mm wide at some point. I've got a square taper bottom bracket currently installed and both cups/threads stick out either side a bit, but my mechanic said it should be fine - seems fine anyway.

    So I'm looking on ebay for a groupset, doesn't matter if its shimano or campagnolo...9 or 10 speed. But the issue i'm thinking is installing BB's like hollowtech/new campag outboard bearings on a bb shell which is a bit odd like mine could be a problem. Is it easier to stick with the square taper that i've got (putting in a longer spindle obviously) and use 9 or 10 speed campag cranks which'll fit?

    Or will hollowtech fit with some spacers and I could then get a shimano groupset?
    OR (final or) use campag crankset (with the square taper) and have everything else shimano? Would that work?

    Many thanks is advance for the replies.

    And here's a photo of the bottom bracket, CheersBob BB Shell..jpg

  2. #2
    afraid of whales Mr IGH's Avatar
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    Back in the day 65mm BB were used on some track bikes for lower Q. I'd just use some spacers. For a ULxx style BB like you show in the picture, I'd use 1.5mm on the drive side and let the other side stick out an extra 1.5mm.

  3. #3
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    So, with some spacers you reckon I'll be ok to install a new style (outboard bearing) BB?
    Cheers

  4. #4
    afraid of whales Mr IGH's Avatar
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    Yes, I'd use 1.5mm each side, install the cranks and measure the chainline, adjust as needed. I've stuffed 73mm BB in a 68mm shell on a low cost repair for a friend, working fine after 2 years.

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