How to identify RD size...

venster
venster Posts: 356
edited October 2015 in Road general
How can I tell whether I've got a short or medium cage derailleur?

I'm running Ultegra 11spd with a 11-28T cassette and wanted to try and fit a 32T, but don't know what size my RD is.

I've found the model number on the mech but doesn't say if it's ss or gs.

This is the bike if it helps...

http://www.cyclesuk.com/en/Wilier-GTR-Ultegra-2015-Road-Bike-Gloss-Black-and-Lime/m-47272.aspx

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