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10-speed mountain bike cassette nirvana.

Those familiar with XTR's legendary quality won't be surprised at all to learn that the new 980-series Shimano XTR Dyna-Sys Cassette takes everything that was great about the 970-series cassette and makes it only better.

The big change, of course, is the addition of a tenth cog, but that's to be expected. The five largest cogs are made of titanium for exceptional durability and weight savings, while the smaller five cogs are made of chromoly that's been nickel-plated to match the longevity of the larger titanium gears while reducing chain friction, which is greater when the smaller cogs are engaged. Cogs are held in place by a lightweight alloy spider, and they're paired so that pedaling forces are distributed over a larger area when that force is applied to the freehub body. This reduces the cassette's ability to dig those little notches into your freehub body while also making your pedaling more efficient. Shimano is known for the uncanny smoothness of its cassettes, too, and the 980 carries this tradition with special ramps and pins on the flanks of the cogs' teeth for effortless and immediate shifting both up and down the cassette, even while pedaling.

The Shimano XTR 10-Speed Cassette CS-M980 is available in two 10-speed configurations - 11/34t and 11/36t. It's held onto your hub with the included XTR alloy lockring. Shimano recommends its use along with the XTR 980 10-Speed HG-X Chain.

  • Computer-designed tooth profiles and shift gates provide crisp, smooth, and quick shifting—even under load
  • Nickel-plated finish resists corrosion and reduces wear for a long life
  • Three-piece spider fights deflection for accurate shifting
  • Five largest cogs are titanium for low rotational weight
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Awesomeness all rolled into one

  • Familiarity:I've put it through the wringer

This cassette is really the best of the best. If you can afford it get one. Don't expect it to last as long. I typically run my cassettes longer than I should; this thing will last 2 seasons of moderate riding; one season for hard on 4 x week riding. When you hold this next to XT one there is an obvious difference.