Licensed Bike Geek
Join Date: Oct 2002
Location: Los Barriles, Baja Sur, Mexico
Posts: 1,360
Bikes: Look 585, Kirk Terraplane, Serotta Ottrott, Spectrum Super Custom, Hampsten Carbon Leger Tournesol
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I have 4 bikes, all running 34/50 cranks, 11/32 cassettes and all using Ultegra 6700 rear derailleurs.
Since you’re going to use a 30t cassette regardless of the rear derailleur, I’d tell you to try the new cassette with your existing derailleur. You’ll have to adjust the B-screw so the upper pulley doesn’t clash with the large cog when in the Little/big combo.