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  1. #1
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    Redline Monocog - What bottom bracket?

    I need to order a bottom bracket for my 2006 monocog frame. The BB on the complete bike is "VP Sealed Bearing Cartridge 68mm-116mm jIS"

    I have a square taper Shimano crankset but I don't know what length square taper UN-72 (or similar) I should get? Also what does the JIS mean?

    Thanks!

  2. #2
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    Common spindle lengths for square taper BB's are 107,110,113,115,118,122 &127 -- depending on the model of crankset you use.

    Just a guess --> JIS = Japan Industrial Standard

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    Quote Originally Posted by Zanetti
    Common spindle lengths for square taper BB's are 107,110,113,115,118,122 &127 -- depending on the model of crankset you use.

    Just a guess --> JIS = Japan Industrial Standard
    It's just a generic Shimano OEM takeoff crankset. Where do find the "required" BB?

    Or since I'm running it on a SS can I just run a 107mm and space the cog to match?

  4. #4
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    Quote Originally Posted by Pivvay
    It's just a generic Shimano OEM takeoff crankset. Where do find the "required" BB?

    Or since I'm running it on a SS can I just run a 107mm and space the cog to match?
    Does it have a number on it somewhere? Like FCM-xxx?

    A 107 would likely work, the only limiting factor is crankarm/chainstay clearance.

  5. #5
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    Quote Originally Posted by Zanetti
    Does it have a number on it somewhere? Like FCM-xxx?

    A 107 would likely work, the only limiting factor is crankarm/chainstay clearance.
    It says FC-M440 on it. Thanks for the help.

  6. #6
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    Quote Originally Posted by Pivvay
    It says FC-M440 on it. Thanks for the help.
    I installed a UN-73 68x107 bottom bracket. The chainring is plenty far away from the frame so even with a 36t I'll be fine. The chain is on the outside position of the crank. Hope this helps in case anyone else was watching the thread.

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