HELP: Chain falls off outside when back pedalling in Big 48T to small 12T?

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  • HELP: Chain falls off outside when back pedalling in Big 48T to small 12T?
  • Premier Icon scotroutes
    Subscriber

    binno wrote:

    any suggestions or solutions greatly appreciated.

    Stop back pedalling

    mmel
    Member

    As above.

    I find I go further when pedaling forwards, nothing good ever comes from back pedaling…

    Premier Icon wwaswas
    Subscriber

    You should only be in 48/12 when hurtling along and pedalling hard, if you’re riding anything technical that needs a back pedal to negotiate then you need a different gear!

    Premier Icon Onzadog
    Subscriber

    Comment removed, thought it was a triple.

    binno
    Member

    Really? Hummm…. this has never happened on any other bike I’ve owned, hence my concern.

    It’s not that I’m riding along back pedalling though. It takes only a small turn back (1/2 tops) for the chain to fall off, so when coasting down a steep hill, it’s actually very easy for the chain to slip off (outside edge only).

    Premier Icon wwaswas
    Subscriber

    is it a new chain too?

    if not I’d suspect worn chain/new cassette combo.

    cynic-al
    Member

    It’s not uncommon IME – back-pedalling in the biggest gear makes the chain go slack on top, esp with a stiff freehub seal.

    Just don’t do it – forward pedalling is an easy habit to form instead.

    binno
    Member

    Little stumped here,

    Fitted a new 12-30T rear cassette, mid length rear mech (10spd shimano) to a 48T / 36T Truativ elita GP chain set. Using the 1mm spacer+ magic spacer on my mavic wheels.

    Chain line measures up fine 44.5mm, chain length + condition is fine, B limit screw + rear mech set up is fine.

    I suspect that the chain (only happens in small big combo) is being pulled to far over to the outside edge by the 10spd rear cassette vs the road front chain rings, however the same model bike sells with the same chain line though different cranks.

    Could it be the out chain ring teeth profile?

    any suggestions or solutions greatly appreciated.

Viewing 8 posts - 1 through 8 (of 8 total)

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