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  1. #1
    Doomsled funbun's Avatar
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    Cottered to Seald BB conversion

    Can you make a cottereed bottom bracket use a sealed bottom brakets? I've got 2 goo lugged frames, but I want to use more modern cranks. What can I do? What are my options?
    Check it out:

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  2. #2
    Senior Member sydney's Avatar
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    Quote Originally Posted by funbun
    Can you make a cottereed bottom bracket use a sealed bottom brakets? I've got 2 goo lugged frames, but I want to use more modern cranks. What can I do? What are my options?
    No problenm, as long as the BB shell is threaded for an available cartridge type. English and Italian threading would be would be examples for which there are plenty of choices.

  3. #3
    feros ferio John E's Avatar
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    You can get French or even Swiss Phil Wood cartridge BBs from Sheldon. Alternatively, you can probably replace just your spindle with one designed for cotterless cranks, as I have done on several bikes, including two Peugeot UO-8s. The variables are spindle length, distance between bearing surfaces, and the thickness of your BB cups.
    "Early to bed, early to rise. Work like hell, and advertise." -- George Stahlman
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  4. #4
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    Quote Originally Posted by funbun
    Can you make a cottereed bottom bracket use a sealed bottom brakets? I've got 2 goo lugged frames, but I want to use more modern cranks. What can I do? What are my options?
    Yes, I have done this recently on a 70s/80s (?) Raleigh that is now my regular commuter. Measured up the BB shell length and diameter; spoke with some helpful people at SJS cycles (UK shop); ordered a Shimano sealed BB in the correct size; removed old cottered cranks, BB shells, bearings etc.; cleaned and greased threads and screwed in the new sealed unit using a Shimano BB tool. The tricky part for me was getting the right spindle width as I was converting from 5 speed deraullier gears to Nexus 4 speed hub so had to take care to get the right chainline; everything is working fine and haven't had any problems in almost 1000 miles.

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