Have bike, will travel
Join Date: Feb 2006
Location: Lake Geneva, WI
Posts: 12,284
Bikes: Ridley Helium SLX, Canyon Endurance SL, De Rosa Professional, Eddy Merckx Corsa Extra, Schwinn Paramount (1 painted, 1 chrome), Peugeot PX10, Serotta Nova X, Simoncini Cyclocross Special, Raleigh Roker, Pedal Force CG2 and CX2
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You will need a MTB rear deraillear if you want a 32 cog cassette. The problem is that the Ultegra SS short cage derailleur will not fit a 32 cog. The factory has a 27t max cog size specification for Ultegra, however most will accept 30t and the GS will often (but not always) go up to 32t in practice.
Harris Cyclery makes a 13-30 nine speed cassette made from Shimano parts that will fit with an Ultegra ss derailleur.