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"Anti spin" cranksets - do they exist ?

Van NickVan Nick Posts: 68
edited August 2008 in Workshop
Last week, whilst out on my bike, my chain suddenly jumped out of gear and came off and the resistance against which I was pedalling was suddenly no longer there.

The result was that I came off, hitting the middle of the lane (with cars behind), sustaining bruised ribs, and skinned right shoulder, elbow and knee.

It was all very painful, but it could have been a whole lot worse.

By pure coincidence, our local post girl was telling me that exactly the same thing had recently happened to her whilst out on her round and she showed me the stitches around her eye.

This got me wondering if there is a crankset on the market, that does not spin if a gear slips, the chain breaks or comes off for some reason whenever the resistence suddenly stops.

Maybe it could work on some sort of ratchet system.

I'd be interested in any thoughts that people might have.


  • synchronicitysynchronicity Posts: 1,415
    As far as I know nothing like that is available...

    If you wish to minimise (or eliminate the danger), ensure that your gears are adjusted to perfection & you replace the chain when its time is up.

    There are other possibly 'safer' power-transfer systems for the drivetrain, eg belt drives & shaft drives, and convention chain driven drivetrains but using hub gears.
  • alfabluealfablue Posts: 8,497
    You can get "chain devices" designed to keep chains on mtb chainsets, but I would expect most would shun the extra weight and drag associated with such things on a road bike. It is a nasty accident, but is surely only likely with a poor setup or something actually breaking in the drivetrain.
  • ride_wheneverride_whenever Posts: 13,279
    as above, you could fit a mtb chainguide, but you're better off avoiding crossing gears and having them set up well...
  • MIsterGoofMIsterGoof Posts: 128
    if its comming off on the inside (frame side), the checkout a DEDA DOG TOOTH, as used by most bikes in the TDF
  • satanassatanas Posts: 1,303
    Deda Dogfang, not tooth, and yes highly recommended for any bike that tends to drop the chain to the inside, i.e., many bikes with triple chainwheels and STI.
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