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Bottom bracket question

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  • 20-11-2013 12:31am
    #1
    Walshey96
    Registered Users Posts: 215 ✭✭


    Hi if my frame takes a BB that is 68x103mm could I use a 68x109mm one instead? Can't find a suitable one online. BTW my Frame is a Charge Plug Freestyler.


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    #2
    joxerjohn
    Registered Users Posts: 396 ✭✭joxerjohn


    It should work but the wider axle will mean that the chainset will be set a little further away from the frame. This will have an impact on your chainline. Also as a result you will also need to adjust your front derailleur and depending on it's spec this might not be able to reach another 6mm. In which case a replacement FD would be needed. It would therefore be better for you to replace with another 68/103 which should be readily available on CRC or Wiggle or from a good LBS.


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    #3
    Walshey96
    Registered Users Posts: 215 ✭✭Walshey96


    joxerjohn wrote: »
    It should work but the wider axle will mean that the chainset will be set a little further away from the frame. This will have an impact on your chainline. Also as a result you will also need to adjust your front derailleur and depending on it's spec this might not be able to reach another 6mm. In which case a replacement FD would be needed. It would therefore be better for you to replace with another 68/103 which should be readily available on CRC or Wiggle or from a good LBS.

    Forgot to mention the bike is a fixie.


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    #4
    Alek
    Registered Users Posts: 4,520 ✭✭✭Alek


    this might not be able to reach another 6mm

    103mm > 109mm is only 3mm on each side.

    This is not too bad, considering that 3/32 chains bend a lot more within the gearing range.


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    #5
    Alek
    Registered Users Posts: 4,520 ✭✭✭Alek


    If its a fixie, its better to keep the chainline exact, though.


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    #6
    Walshey96
    Registered Users Posts: 215 ✭✭Walshey96


    Alek wrote: »
    If its a fixie, its better to keep the chainline exact, though.

    The Chainline is pretty exact now to be honest. Do you know of any sites where I'd get a 68x103mm Bottom Bracket? Tried CRC,Wiggle and Evans with no joy.


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    #7
    ford2600
    Closed Accounts Posts: 4,457 ✭✭✭ford2600


    Walshey96 wrote: »
    The Chainline is pretty exact now to be honest. Do you know of any sites where I'd get a 68x103mm Bottom Bracket? Tried CRC,Wiggle and Evans with no joy.

    Can you move chainring inline of spider to compensate for bottom bracket bringing it out?

    I did with mine


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    #8
    RockWerchter
    Closed Accounts Posts: 202 ✭✭RockWerchter


    Here: http://www.sjscycles.co.uk/fsa-power-pro-jis-bottom-bracket-68-mm-shell-english-thread-prod25307/


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    #9
    Walshey96
    Registered Users Posts: 215 ✭✭Walshey96


    ford2600 wrote: »
    Can you move chainring inline of spider to compensate for bottom bracket bringing it out?

    I did with mine

    I'll try doing that.


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    #10
    Walshey96
    Registered Users Posts: 215 ✭✭Walshey96


    Would these cranks be any use? http://www.sjscycles.co.uk/sturmey-archer-fct28-single-chainset-48t-with-170-mm-cranks-prod23290/?currency=eur


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