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  • If you only have a single front ring, can you use a short cage mech where you would have otherwise needed a medium or long cage?

    Common misconception. The length of the cage doesn't limit the size of sprocket - the design of the derailure does. Length of cage only defines how much chain slack can be picked up.

    Shimano di2 6870 if that makes a difference.

    Absolutely it does. Max tooth without bodging is 28t IIRC.

  • If you only have a single front ring, can you use a short cage mech where you would have otherwise needed a medium or long cage?
    Common misconception. The length of the cage doesn't limit the size of sprocket - the design of the derailure does. Length of cage only defines how much chain slack can be picked up.

    Shimano di2 6870 if that makes a difference.
    Absolutely it does. Max tooth without bodging is 28t IIRC.

    I've been running 11-32 on the Time Machine since it was built, with 6870 (long cage) and it's been absolutely fine.

    Me Julie is running a short cage 6800 mech on an 11-32 block, and thats been absolutely fine.

    On my old cross bike I ran a short cage Ultegra mech on an 11-32 block with a 44T single front ring, and that was fine.

    = I think that a short cage Ultegra mech will happily work with a 32T sprocket, based on extensive personal experience. Your mileage may vary, of course.

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