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  1. #1
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    Cottered Cranks to Sugino RD

    Hi,

    I have cotttered crank on a converted fixie and can't stand how much they loosen due to the torque. So i'm going to switch over to Sugino RD cranks...I'm just making sure I'm doing this right. If you can let me know if my logic is correct and if i am missing anything i would appreciate it..sorry that i am kinda clueless about this

    First, take out cotter pins and get rid of cottered cranks
    Second, Get new bottom bracket compatable with Sugino RD cranks (I think i need a new bb to be compatible with this type of crank system, right?)
    Third, Install bb and cranks
    Fourth, Go ride

    Thanks

  2. #2
    The Improbable Bulk Little Darwin's Avatar
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    You do have it right.

    Although, many people with a lot of torque have rode many miles on cottered cranks without them loosening.

    The right size cotter, and installing with a cotter press will do the job.

    You do get some weight savings going cotterless, but to me the cottered look would go good with a fixie.

  3. #3
    Gone, but not forgotten Sheldon Brown's Avatar
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    Quote Originally Posted by tron437 View Post
    Hi,

    I have cotttered crank on a converted fixie and can't stand how much they loosen due to the torque. So i'm going to switch over to Sugino RD cranks...I'm just making sure I'm doing this right. If you can let me know if my logic is correct and if i am missing anything i would appreciate it..sorry that i am kinda clueless about this

    First, take out cotter pins and get rid of cottered cranks
    Second, Get new bottom bracket compatable with Sugino RD cranks (I think i need a new bb to be compatible with this type of crank system, right?)
    Third, Install bb and cranks
    Fourth, Go ride
    This may be as easy as that, but odds are it won't. Can't tell since you neglected to mention what kind of frame you're dealing with.

    If it's an English frame made by Raleigh in Nottingham, or if it's French or Swiss, you could be opening a big can of worms.

    If it's an Asian-built frame, or an English frame built outside of Nottingham, it will be as easy as you mention.

    See also: http://sheldonbrown.com/bottombrackets

    Sheldon "Not So Fast..." Brown
    [COLOR=blue][CENTER][b]Harris Cyclery, West Newton, Massachusetts[/b]
    Phone 617-244-9772, FAX 617-244-1041
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  4. #4
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    Quote Originally Posted by Sheldon Brown View Post
    This may be as easy as that, but odds are it won't. Can't tell since you neglected to mention what kind of frame you're dealing with.

    If it's an English frame made by Raleigh in Nottingham, or if it's French or Swiss, you could be opening a big can of worms.

    If it's an Asian-built frame, or an English frame built outside of Nottingham, it will be as easy as you mention.

    See also: http://sheldonbrown.com/bottombrackets

    Sheldon "Not So Fast..." Brown
    I ran into this problem about 20 years ago trying to replace the "Stronglight" cottered crank on a friend's early 70's Nottingham Raleigh with a square taper SR crank. I removed the original crank and adjustable cup and then discovered Raleigh proprietary bb threading.

    What I wound up doing was using the SR bb spindle installed in the Raleigh's original cups. It worked out ok and the bike is still in service. If we ever destroy one of the cups, we are going to have a real problem.

  5. #5
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    its is english threading so it sounds like im ok

    on another note, what is the best way to get cotter pins out without a cotterpress...i really want to do this crank conversion myself but dont want to buy a 50 dollar cotter press. Thanks!

  6. #6
    Senior Member Iowegian's Avatar
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    Since it sounds like you don't care about the cotters anymore, just tap/pound them out with a hammer. Make sure to support the bottom side of the crank arm so you don't apply torque to the BB shell.

  7. #7
    The Improbable Bulk Little Darwin's Avatar
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    Agreed. Even though you are having trouble with the cranks loosening, so it shouldn't be the case, they are sometimes stubborn.

    For this (and many other cycling related issues) search sheldonbrown.com for ideas and thoughts.

  8. #8
    Gone, but not forgotten Sheldon Brown's Avatar
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    Quote Originally Posted by tron437 View Post
    ...what is the best way to get cotter pins out without a cotterpress...i really want to do this crank conversion myself but dont want to buy a 50 dollar cotter press.!
    Wow, you've found a cotter press for only fifty bucks! ;-)

    You need an IIAI. See: http://sheldonbrown.com/cotters for instructions.

    Sheldon "Inerrtial Impact Alignment Instrument" Brown
    [COLOR=blue][CENTER][b]Harris Cyclery, West Newton, Massachusetts[/b]
    Phone 617-244-9772, FAX 617-244-1041
    [URL= http://harriscyclery.com] http://harriscyclery.com[/URL]
    Hard-to-find parts shipped Worldwide
    [URL=http://captainbike.com]http://captainbike.com[/URL]
    Useful articles about bicycles and cycling
    [URL=http://sheldonbrown.com]http://sheldonbrown.com[/URL] [/CENTER] [/COLOR]

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