Shimano Dura-Ace CS-7900 Cassette - Road Bike Shop
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|Shimano Dura-Ace CS-9000 11-Speed Cassette
In the cycling world, not much can happen with the addition of three grams. Try to imagine the best possible upgrade to your bike that falls within this weight. Give up? Well, we thought of something for all of you 7900 users -- the Shimano Dura-Ace CS-9000 11-Speed Cassette. You read that right...