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  1. #1
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    - Proflex 857 - Chainring help

    I have a Proflex 857, yes i know its old but still rides great.
    I want to know what the largest chainring i can fit onto this bike.
    And does any standard 4 bolt ring fit on it?
    All original parts
    Shimano Deore XT crank
    Shimano Deore XT FD-M789

    Also, kinda off topic but does anyone know what the seat post diameter is, just wanted to make sure I am measuring correctly.

    Aloha!

  2. #2
    All 26.5" all the time!
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    Quote Originally Posted by lbrammer78
    Shimano Deore XT crank
    What model XT crank? FC-M7xx? The '97 XT four arm crank (FC-M739) had an integrated spider/large chainring that was only offered in 42 and 44 tooth sizes.


    Quote Originally Posted by lbrammer78
    Shimano Deore XT FD-M789
    Are you sure it isn't an M739 front derailleur? 44 teeth would be the largest ring you could use with it.

  3. #3
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    Thanks for the response.

    Yes I made a typo you are correct on the FD and the crank.

    So basicly parts swapping would be my only option for a
    larger chainring. Thanks.

  4. #4
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