Will my 105 rear mech take a 28T sprocket?

Hi guys/gals
Hope you can help. I've got a Shimano 105 rear mech. I'm guessing these are short cage... (a question more than a statement)
Are these compatible with a 12-28T rear cassette?
If not, I've just wasted some money. Doh!
Hope you can help. I've got a Shimano 105 rear mech. I'm guessing these are short cage... (a question more than a statement)
Are these compatible with a 12-28T rear cassette?
If not, I've just wasted some money. Doh!
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tweak the tension screw if the top jockey is rubbing
ability to handle 28t is not linked to cage length but the geometry of the mech itself. In other words, a long cage road mech isn't like a mtb mech. Mtb mechs can handle bigger sprockets than road mechs because they have different geometries, which hold the jockeys further away from the sprockets
Saracen Hytrail - the workhorse - now pensioned off
Kinetic-One FK1 roadie - the fast one - hairy legs though!
Cannondale Jekyll Lefty MTB - the muddy one which keeps tipping me into gorse bushes!
(Many thanks again to Duffler for the kind donation)