can i run a 11-28 cassette with a 6600 (ultegra) or 5600 (105) rear mech? The shimano site says you need the newer 6700 / 5700 mechs for a 11-28 and max for the older mechs is a 27 tooth.
some frames and chain tension will manage it but some won't, even with the tension screw on max. I speak from experience. I've got 6600 mechs to handle 11-28 but I've had others end up rubbing the top sprocket, no matter what.
You can either try and see, or go for the 5700/6700 mech and it'll definitely work.
Facts are meaningless, you can use facts to prove anything that's remotely true! - Homer
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some frames and chain tension will manage it but some won't, even with the tension screw on max. I speak from experience. I've got 6600 mechs to handle 11-28 but I've had others end up rubbing the top sprocket, no matter what.
You can either try and see, or go for the 5700/6700 mech and it'll definitely work.
Just wish Shimano would make a 13-28 as 11-28 is ridiculous for a normal cyclist!