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  1. #1
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    can you use a 9 speed chain on a brompton?

    hi there i know i can replace my brompton chain with an 8 speed chain, does anyone know if i can use a 9 speed chain? i have a spare one on a shelf at home.

  2. #2
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    It depends on whether you are running the Brompton 2sp derailleur or not and on the inside and outside widths of your 9sp chain. You can find out whether it will work for free, just fit it and see.

  3. #3
    jur
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    The inside widths of derailer chains are all narrow. If the 8sp works, so will the 9sp.
    My folding bike photo essays www.dekter.net/

  4. #4
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    Quote Originally Posted by jur View Post
    The inside widths of derailer chains are all narrow. If the 8sp works, so will the 9sp.
    Not necessarily, if he has the Brompton derailleur. It relies on the external width of the chain to shift properly.

  5. #5
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    Quote Originally Posted by barneybarney View Post
    hi there i know i can replace my brompton chain with an 8 speed chain, does anyone know if i can use a 9 speed chain? i have a spare one on a shelf at home.
    Hello there barneybarney! Have you moved house now, & settled into your new job?

    I have a M3L Brompton now, & a few weeks ago fitted a 4 1/8" chain from a Chainreaction sale, which works fine, although it's not supposed to :-)))

    Which Brompton do you have?

    John

  6. #6
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    Quote Originally Posted by cyclistjohn View Post
    Hello there barneybarney! Have you moved house now, & settled into your new job?

    I have a M3L Brompton now, & a few weeks ago fitted a 4 1/8" chain from a Chainreaction sale, which works fine, although it's not supposed to :-)))

    Which Brompton do you have?

    John

    hi cyclistjohn, no new job as yet but have moved out of london and have a little baby girl! so plenty going on. how are you?

    i have the 6 speed brompton and ride the beejesus out of it! its a very faithful friend.

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    hi there - I opted for a sram pc850 chain from evans cycles, evans said its the chain they recommend to all their 6 speed brompton customers and brompton talk said that any 8 speed chain should do (although I couldn't find a specific ref for this chain).

    I fitted it fine but the chain continues to skip under load, especially when moving off. I checked the rear sprocketts and they don't seems worn. Would any body know what i should do to cure this?

    barney

  8. #8
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    I would guess that, despite appearances, your cogs are worn and require replacement.

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