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Bottom bracket removal issues

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  • 20-02-2012 11:07am
    #1
    mcgratheoin
    Registered Users Posts: 1,461 ✭✭✭


    I've two old style cup & cone bottom brackets and I'm not sure how to get them off on the drive side. The manky looking BB_2 one is more important as that frame is going to be painted/ powder coated as part of a renovation and it needs to come off, but the other one is no big deal if I can't get it to move.

    Is there a tool out there for taking these off or should I bring the frames by a bike shop?


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    #2
    Hungrycol
    Registered Users Posts: 2,246 ✭✭✭Hungrycol


    English thread BB = Drive side loosens clockwise. Non drive side conventional loosens anticlockwise.

    Yes it helps to have the proper tools that you'll be able to fin pretty easily on Chain Reaction cycles or similar.


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    #3
    abcdggs
    Registered Users Posts: 1,831 ✭✭✭abcdggs


    Those cups are a pain to get off, if you have any welding experience welding a bb axle through the centre of the cup. then using a crank arm there whoudl be plenty of torque to get it out. Rothar in phibsborough will certainly be able to get it out for you. but i've heard bee-cycles on SCR is one of the best in dublin for stuck BBs


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    #4
    seamus
    Registered Users Posts: 68,317 ✭✭✭✭seamus


    A good quality large adjustable spanner should work for the first one (assuming that there's a matching flat part on the bottom of the cup).

    The second one would come out with the careful use of an adjustable spanner, but only if it's fairly free already. Looking at that one, I doubt it is.

    As said above, rothar and bee-cycles specialise in older bikes so should be able to assist with these.


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    #5
    mcgratheoin
    Registered Users Posts: 1,461 ✭✭✭mcgratheoin


    cheers - had one taken off in rothar before with a weld, but am hoping to reuse the BB on the second one so don't want to ruin it. It's an old Raleigh frame so it's the non-standard 26tpi thread. Might bring it into Bee alright - I'll probably get them to build the rear wheel for me so I can kill two birds with one stone.

    Option 2 is just to tape it up during painting and try to clean it out from inside the other side.


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    #6
    tomasrojo
    Registered Users Posts: 11,753 ✭✭✭✭tomasrojo


    The first one is the harder to get off: the flats are very narrow indeed and if there's any stiffness is turning it, you might not be able to keep the spanner on the flats.

    You can buy a special tool, but Sheldon Brown has a makeshift alternative.

    bbtool-bolt.jpg

    http://sheldonbrown.com/tooltips/bbcups.html

    Basically, you need to clamp the assembly onto the fixed cup through the bottom bracket shell (shown in cut-away above) so that the nut is protruding, and then you can get a spanner on the nut.


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