Viewing 11 posts - 1 through 11 (of 11 total)
  • New drive chain – chain length
  • beer247
    Free Member

    Finished building up the new bike last night.

    fitted the chain with the usual big cog – chainring method and added two links + the power link.

    One thing I didn’t do was compress the suspension whilst fitting.

    Will I burst into flames on the first ride?

    martinhutch
    Full Member

    Depends how much chain growth your particular bike produces.

    12s in general is quite fussy about chain length/b screw

    https://dansbikeblog.com/article/how-calculate-correct-chain-length-shimano-12-speed-drivetrain

    joebristol
    Full Member

    This also depends which 12 speed drivetrain you’ve fitted. Shimano has one way of sizing detailed in their user guide, whilst Sram have a different way (on full suss it has to be sagged to the position where it has most chain growth).

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    jkomo
    Full Member

    Let the air out the shock and see what it’s like.

    thols2
    Full Member

    Let the air out the shock and see what it’s like.

    Obvious advice is obvious.

    fathomer
    Full Member

    Shimano 12s is definitely different, as above. With 10/11s I’ve always let air out of shock, fully compress, big/big, add two links. But the chain was far to long on the Mrs new bike. So went with the normal but uncompressed and it’s fine (like the above link actually).

    susepic
    Full Member

    Slight variation on this theme – if i change from a 32T 12Sp Eagle chainring to a 30T chainring – How many links should i take out of the chain? 2 (1 wide/1 narrow) or 4?

    luket
    Full Member

    Slight variation on this theme – if i change from a 32T 12Sp Eagle chainring to a 30T chainring – How many links should i take out of the chain? 2 (1 wide/1 narrow) or 4?

    Well, you’ve gone from 16 teeth forward of the BB to 15. Everything else is staying the same, except a tiny angle change. I’d start with keeping it as it is. If it’s too long then take out one pair of links.

    susepic
    Full Member

    @luket thanks – will give it a whirl

    ads678
    Full Member

    Drive train….

    phil5556
    Full Member

    Slight variation on this theme – if i change from a 32T 12Sp Eagle chainring to a 30T chainring – How many links should i take out of the chain? 2 (1 wide/1 narrow) or 4?

    I did just this last night on my wife’s bike. Using SRAM’s wrap around and overlap by 2 method I took out a complete link (one narrow, one wide). I didn’t try it before shortening so don’t know if it would have been OK or not.

Viewing 11 posts - 1 through 11 (of 11 total)

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