The only cassette here that tells you which freehub body it needs
SHIMANO XT CS-M771, 10-speed, 11–32T, 285 g (10.1 oz)
Shimano’s XT 10-speed cassette, 11-32T at 285 g (10.1 oz), built on two aluminum carriers with an alloy lock ring.
What you are getting
A Shimano XT CS-M771 cassette: 10-speed, 11-32T, 285 g (10.1 oz), with six rings on a spider in a 3+3 structure, an alloy lock ring, and cogs of 11-12-14-16-18-20-22-25-28-32. $59.
It is the only cassette here that publishes the freehub body
“Cassette Body Type: Shimano 9/10/SRAM.”
The tag on this shelf says the freehub body standard matters as much as the tooth range, and this is the one listing in the American survey that answers it. Shimano 9/10-speed and SRAM 8-10-speed share a splined body; 11-speed road and 12-speed bodies do not, which is why a modern wheel will not take this cassette and a 2010 wheel will.
Everything else on this page leaves you to work it out from the speed count.
The spider is where the 285 g (10.1 oz) comes from
“6 rings on spider (3+3 structure)” and an alloy lock ring.
Six of the ten sprockets are riveted to two aluminum carriers rather than being individual steel rings on the hub splines. The carrier takes the load and the steel is only where the chain touches, which is how a cassette with a wide range here is also the lightest of the three cassettes that publish a weight: 285 g (10.1 oz) against 300 g (10.6 oz) for both 8-speed cassettes.
The alloy lock ring saves a few more grams than the “corrosion-resistant steel” one the CS-HG50 names.
11-32 in ten steps, and the steps are mountain steps
11-12-14-16-18-20-22-25-28-32. One tooth at the top, then twos, then threes and fours.
Compare the CS-HG500-10 on this page, also 10-speed: 12-13-14-15-17-19-21-23-25-28. Five single-tooth steps and a 28 at the bottom.
Same speed count, two different bikes. The XT gives you a 32 for climbing and accepts coarse gaps in the middle; the HG500 gives you fine cadence control on the flat and stops at 28. The introduction to this shelf is about exactly this: tooth range is a choice, not a quality.
HG-X and Shadow, named
“Optimized tooth profiles for HG-X chain and Shadow rear derailleur”, and “Chain Compatibility: Dyna-Sys”.
Three named standards, which places the cassette in a drivetrain generation rather than just on a wheel. Dyna-Sys is Shimano’s 10-speed mountain group; HG-X is the chain cut for it. A 10-speed road chain is narrower in its own way and Shimano does not claim it here.
$59, which is the second most expensive on this page
More than every 8-speed and 10-speed cassette here, less than the 12-speed 105. What the money buys is the spider construction, the alloy lock ring, the published body type and the XT name — and 15 g (0.5 oz) over the cheap 8-speeds.
What is not published
No ratio spread as a figure (11-32 is 2.91×), no chain line, and no statement of whether the lock ring is included — the alloy lock ring is listed as a feature, which implies it is.
The reference on the listing is CS4122, which is a distributor code; CS-M771 is the Shimano model and the one to search.
Availability
Read on the day this page was built: $59 at the American Amazon shop.
Read from Keepa on the day this page was last revised; stock and price both move without notice.
Prices quoted in this text were read on 2026-10-06. The live price is at the top of the page.
