Overview Chat Bike Members News Women
Viewing 11 posts - 1 through 11 (of 11 total)
  • 2 x 9 Dropping into the granny ring when backpedalling
  • lbjones
    Free Member

    So… 2 x 9 setup with a superstar chainguide (similar to Blackspire Stinger guide). Everytime I backpedal more than half a turn in the big ring the chain drops down into the granny ring. Its possibly the most irritating thing in the world.

    Any ideas as to a) why and b) how to fix it?

    Its tempting me to get a 1 x 10 setup but that means spending more money than Im happy with right now….

    Posted 10 years ago
    tmb467
    Free Member

    dont backpedal? no really – try not to cos its bad practice and if you do lose the chain it could really mess you up (e.g. run up to jumps or tight switchbacks)

    doesnt really answer the question but I’ve had it happen before and then i broke the shifter trying to get it back into the middle ring

    I’d always assumed it’s to do with releasing chain tension and the chain-line forcing it to move to the left (and then dropping back to the granny) but I cant prove it with science or anything else

    I a lot of chain drops and slips when I went to 2×9, even with a chain guide so just went to 1×10…you could just put a big ring back on if its really a hassle and you dont want the cost

    Posted 10 years ago
    psling
    Free Member

    Believe it or not, a lot of the drive train isn’t really designed for back-pedalling; ramped rings, hooked teeth, etc.. The first thing I’d check is the mech alignment at the chainring but, having said that, my money would be on a sticky freehub.

    Posted 10 years ago
    xiphon
    Free Member

    Learn to pedal forwards, not back. Seriously.

    Posted 10 years ago
    lbjones
    Free Member

    Hmmm, yes not backpedalling would be good I guess, just cant seem to stop doing it!

    Sticky freehub? Any more detail on that, was thinking of issues at the front end rather than the back, how would this have an effect?

    Posted 10 years ago
    psling
    Free Member

    Freehub – it can cause the top run of chain to go slack when you freewheel which may be enough for the chain to drop off the top of the chainring when you back-pedal.

    Posted 10 years ago
    vincienup
    Free Member

    Sticky freehub would affect as it wouldn’t go back and so essentially stall the chain…

    When I had this issue it would tend to jam between the chainring and chainstay and then you took pot luck what happened next. Often it would dechain going small>large but be ok the other way round. It was only when pushing the bike backwards in the house I finally found the problem.

    Worth a look.

    Posted 10 years ago
    lbjones
    Free Member

    Hmm, had a quick play and freehub seems fine, seems to be more an issue at the bottom of the chainrings raterh than the top, looks like the tension at the top stays fine as the freehub moves.

    Looks like its either learn not to backpedal or change to 10 speed, could be an expensice evening…….

    Posted 10 years ago
    Sam
    Full Member

    It’s a result of chainline. I expect it only does it when you are on the top range of the cogs on the rear and the big ring? In which case, you will likely have a similar combination in terms of gear ratio on the smaller ring to smaller cogs.

    Posted 10 years ago
    tom200
    Full Member

    I had a similar issue, I ignored it and tried not to back pedal or freewheel, I destroyed the freehub on the first testing climb.

    Posted 10 years ago
    ivorhogseye
    Free Member

    If you have a closer look at the wheel on the black spire stinger you’ll notice it is stepped. This stops the chain dropping into granny when back pedalling. I suspect your superstar version doesn’t have the step or just has a little ridge. This doesn’t work. Best bet is to get a stinger

    Posted 10 years ago
Viewing 11 posts - 1 through 11 (of 11 total)

The topic ‘2 x 9 Dropping into the granny ring when backpedalling’ is closed to new replies.

Overview Chat Bike Members News Women