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which would mean upgrading my Trek 4500 to a 27 speed bike. I don't like the way my current shifters look, and the X.7's look good and are getting good reviews. I know I'd also have to buy a new cassette, but is there anything else in my drivetrain that wouldn't be compatible with the new shifters? Will the new cassette fit on my current hub? Everything on my drivetrain is still stock, so I'm using Shimano Alivio front derailer, and deore rear.