It was very easy for me to install it. You'll need a cassette tool and chain whip, and if you're going from a smaller size you'll need a new chain. But you probably knew all that. It arrived in the original Shimano packaging and does the job. I installed it with the back of a Tiagra 4700 and it matches the B bolt perfectly. I sized my chain for a big big on a 50-34 crank. In the smallest 2-3 reverse gears, the chain rubs against the small chain ring, but it shouldn't be in these gears!
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