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Cassette help please!

Hi all, I'm new around here so hello - and go easy on me!

I've got some events lined up for when summer arrives, namely the Dartmoor Classic and Etape du Tour and hills are not my forte (strange choice of events given my weaknesses, but they're the ones we're meant to target right!?). I have a compact chainset and 11-28 cassette. My question is how bigger cassette (sprocket) can I squeeze in on my 105 (5700 short cage) rear mech? Was wondering specifically if a 11-32 would fit and whether the real world gains would be significant?

Any help appreciated,

Kev

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