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Howard in reply to @danb

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.

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gbj_tester in reply to @Howard

The length of the cage doesn't the limit size of sprocket

Although an old school short cage RD won't actually take up all the slack on an 11-42 cassette :-)

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Howard in reply to @gbj_tester

You could still run it, you'd just end up with chain flapping around :)

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