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Chain derails on cassette when back-pedaling

ilovedirtilovedirt Posts: 5,798
edited May 2013 in MTB workshop & tech
I've got a new 10sp zee setup on my new bike, and I've set it up so that it all shifts correctly, but when I backpedal, the chain derails on the cassette. For example I've got it on the biggest sprocket, and it'll start to derail into the higher gears. Any ideas why? This is really irritating me.
Production Privee Shan

B'Twin Triban 5

Posts

  • Chunkers1980Chunkers1980 Posts: 8,035
    Why are you back pedalling?
  • nicklousenicklouse Posts: 50,675 Lives Here
    it it normal and happens on all bikes.

    more so when everything is new.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
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  • ilovedirtilovedirt Posts: 5,798
    Chunkers1980 wrote:
    Why are you back pedalling?
    Do you never backpedal?
    Production Privee Shan

    B'Twin Triban 5
  • ilovedirtilovedirt Posts: 5,798
    nicklouse wrote:
    it it normal and happens on all bikes.

    more so when everything is new.
    Fair enough, I guess I've never noticed it before. Or perhaps my old drivetrain was so worn in that it just didn't happen.
    Production Privee Shan

    B'Twin Triban 5
  • The RookieThe Rookie Posts: 27,802
    If you think about it, there is no derailleur to control where the chain goes when it's going backwards, the chain will tend to shift towards the middle of the cassette (in line with the chainwheel).
    Current steed - Whyte T129, 2013 frame, mongrel Revelations, Giant dropper, Stans S1 wheelset. 12, Magura Trail Sport brakes, 1x11. 12.8Kg
  • ilovedirtilovedirt Posts: 5,798
    Yeah, I figured that afterwards, maybe it's more likely to happen with the closer spacing of 10sp? It just didn't happen on my old drivetrain
    Production Privee Shan

    B'Twin Triban 5
  • danlikesbikesdanlikesbikes Posts: 3,898
    Find it common if spinning the cranks backwards whilst cleaning the chain, don't think its too much to worry about.
    Pain hurts much less if its topped off with beating your mates to top of a climb.
  • bennett_346bennett_346 Posts: 5,029
    Mine is ten speed and works fine backpedalling. It has to, some stuff i do requires a bit of back spinning.
  • bikaholicbikaholic Posts: 350
    It means that the chainrings are too far outboard.

    Adjust the chainline and/or reduce the size of the largest rear cogs and/or front chainring.
  • nicklousenicklouse Posts: 50,675 Lives Here
    bikaholic wrote:
    It means that the chainrings are too far outboard.

    Adjust the chainline and/or reduce the size of the largest rear cogs and/or front chainring.
    no it does not mean that.

    yes having the chain line incorrect can result in that but it works both ways. bring it in and the chain "could" do the "same" on the "small" cogs.

    but the most common issue is people just dont normally do this. and more so when they get a new bike but when they change to new kit they expect everything to work as it was before which it will not do.
    ilovedirt wrote:
    Yeah, I figured that afterwards, maybe it's more likely to happen with the closer spacing of 10sp? It just didn't happen on my old drivetrain
    How would closer spacing do that? it has no effect on it. andthe cog is in the same place as the old one.

    it just that it is new.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • bikaholicbikaholic Posts: 350
    nicklouse wrote:
    bikaholic wrote:
    It means that the chainrings are too far outboard.

    Adjust the chainline and/or reduce the size of the largest rear cogs and/or front chainring.
    no it does not mean that.

    yes having the chain line incorrect can result in that but it works both ways. bring it in and the chain "could" do the "same" on the "small" cogs.

    Try it and see.
  • cooldadcooldad Posts: 32,599
    bikaholic wrote:
    nicklouse wrote:
    bikaholic wrote:
    It means that the chainrings are too far outboard.

    Adjust the chainline and/or reduce the size of the largest rear cogs and/or front chainring.
    no it does not mean that.

    yes having the chain line incorrect can result in that but it works both ways. bring it in and the chain "could" do the "same" on the "small" cogs.

    Try it and see.
    Seriously? Fart around with cassette and chainring sizes to try and achieve something totally pointless?
    Think about it - the chainline is only ever going to be 'perfect' on one cog - whichever one it is the chain will naturally gravitate to that one.
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  • spuddlespuddle Posts: 61
    Happened on my 1x10 setup with a directional shimano chain, when the chain wore out got a KMC none directional one and didn't do it anymore.
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