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There's a possibility it may work.
If you have 11-32t on your wheel already with the 105 GS, how far have the b-screw gone in?
If it managed to clear a 32t cassette on the small ring with little adjusting on the b-screw, then try and tighten it further and see how much gap you can obtain between the upper jockey wheel and 32t sprocket.
Hi everyone,
New Shimano CS-HG800-11 cassette goes all the way down to 34t (11-34). Good news for my weak knees, however tech docs also say the new cassette is only compatible with (also new) Ultegra RD-R8000-GS. Any thoughts as to whether the new cassette will work with good ol' 105 RD-5800-GS? Possibly soneone already had an experience? Thank you.