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Shimano Ultegra CS6500 9-speed cassette must be used with Shimano or SRAM 9-speed chain.
This 9-speed has same overall width as 8-speed.
Aluminum carrier reduces weight and increases rigidity
This is the cassette I use on my main ride, a 650B low trail road bike that sees a lot of dirt and gravel as well as good paved roads. I got about 7,000 miles out of my first one and am just about to purchase an identical replacement, as a couple of the cogs are beginning to slip under heavy pedaling. 4 stars because Shimano doesn't seem to offer individual cogs--gotta replace the whole thing even though 7 out of the nine are still fine. Otherwise it's been great, lightweight, smooth shifts with my Dura-Ace 9 speed derailleur and Wipperman Connex 9sX SS chain (Hey Ben's, how about selling these chains? --wish I could buy them here) I particularly like the 12-27 gearing, not that common anymore, but perfect for a bike that sees varied terrain, but still feels like a performance machine when the conditions are right.