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  1. #1
    uhh, bike...rider.....
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    replacing BB on Dumpster Bike, cotter pin Cranks?

    So, I have rescued a steel dumpster horse. it was Laying on the side of sunset in San Francisco. It's a blue Free Spirit FS12. Official Korean Steel. I picked it up because My lady has been begging for her own hotpink rattle can Fixie. It's a Sear bike I'm pretty sure, but will work well for her first suicide hubbed fixie. Anyhoo, of course it has those disgusting cotter pinned cranks. I hammered out the pins and pulled out the bottom bracket. I bought a 40t cog and new crank arms to fit off a guy on CL. Now I need a BB. What would be the cheapest replacent BB so I can put on the new cranks?
    Anyone know the usual size for a replacemnt BB on a sears bike? I can't find my tape measure.
    kirk

  2. #2
    Senior Member
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    Most likely is 68mm english. Spindle length would probably be around 110-130 depending on your cranks and chainline.

    Just pick up any sealed BB unit. It'll be cheap.

  3. #3
    jack of one or two trades Aeroplane's Avatar
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    Quote Originally Posted by nitropowered
    Most likely is 68mm english. Spindle length would probably be around 110-130 depending on your cranks and chainline.

    Just pick up any sealed BB unit. It'll be cheap.
    +1. Ditch the old cups and get a cheap Shimano thing. No worries.
    Quote Originally Posted by Dr Irwin Goldstein
    Men should never ride bicycles. Riding should be banned and outlawed. It is
    the most irrational form of exercise I could ever bring to discussion.

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