Originally Posted by
Robert A
How can I identify which Shimano R8000 derailleur I have -- short cage and medium cage? Medium cage is required for cassettes larger than 30t.
Are there specific markings to look for?
Measure from pulley center to pulley center on the arm. If it's about 3.5", then it's a GS RD.
No harm in trying the SS RD with a 32t cassette, if that's what you have. Move the B screw and give it a try.
As for the old cassette removal, it takes 30seconds. The labor is basically non existent. Dont think twice about mounting/removal of a cassette. It's a simple tool and almost no effort.
A 50/34 compact r8000 costs +/-$215. A 34/30 bailout is the same ratio as a 36/32 bailout. Yes it's more $, but it keeps the same jumps in the cassette you have and you will presumably use the 11 and/or 12 tooth cogs more often. I assume you dont spin out on 52/11 right now.
Just something to consider.