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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.
1x11 derailleur question. 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? I.e when using an 11-32 cassette
Shimano di2 6870 if that makes a difference.