Home Page

Cart, contains 0 items

When autocomplete results are available use up and down arrows to review and enter to select. Touch device users, explore by touch or with swipe gestures.
Expert Help
Earn Rewards
  • Just In
  • Learn

SLX CS-M7100 12-Speed Cassette

Be the first to review

Out of Stock

Don't worry though, we have a lot more Mountain Cassettes in stock than that.

Shop Similar Products

Why We Like The SLX CS-M7100 12-Speed Cassette

When Shimano's 12-speed cassette hit trade show floors last year it made quite the noise. While the brand is famous for its pristine engineering and meticulous approach to components, we'd be lying if we said that its designers don't take their sweet time when new ideas hit the table. It may have taken a few years to see them jump into the twelve-speed game, but at the end of the day, we appreciate the time taken, as the end result offers precision that's been tested and well thought out — and we're as pleased as ever to see the trickle-down technology seep through the lineup to the new SLX CS-M7100 12-Speed Cassette. The SLX 12-speed cassette sees all of the same smooth-shifting technology as its pricier brethren, but with more economical materials that allow Shimano to drop the price, making it all the more palatable when you're getting ready to upgrade your rig, or build up your dream bike.

Shimano's 12-speed groupset pushes boundaries beyond its competition by offering multiple gearing options to better suit all kinds of riders. A close-step 10 - 45-tooth range cassette makes an ideal choice for intensely precise cross-country applications in which every small step between cogs makes a difference, while the beefier 10-51 cassette offers you the ultimate bail out cog for tedious climbs up steep fire roads when you're working your way to the second stage of an enduro race. And unlike other 12-speed groupsets, Shimano builds the CS-M9100 cassette to play well with both 1-by and 2-by applications, so you don't have to feel limited to a gear range that doesn't optimally suit you. Both cassettes are built to pair up with Shimano's Microspline freehub interface, allowing for room for that extra 10-tooth cog.

When it comes to ramping, we have to say that Shimano's 12-speed cassette pushed well beyond our expectations, offering silky smooth shifting to its lofty cassettes. Hyperglide+ cogs utilize guide ramps on both sides of its surfaces, which pairs with its proprietary chain that is capable of engaging two cogs simultaneously during both upshifts and downshifts, enabling faster upshifts that take just one third of the time of previous, non Hypergide+ groupsets. The cassette features a single aluminum outer cog, and steel inner cogs that are all riveted to a cold-forged aluminum beam spider. This does come at a weight penalty over the pricier XTR cassette that packs in more aluminum, and titanium cogs, but we think its a concession worth making when it comes with huge weight savings, while offering the durability you need from a workhorse cassette.


  • Shimano trickles-down the tech to this 12-speed workhorse cassette
  • A close-step, and wide-range option fits any rider's needs
  • 10-45 cassette is ideal for XC racing when every cog matters
  • A beefy 51-tooth bailout cog in wide-range offers respite on climbs
  • Aluminum outer cog blends with steel inner for robust durability
  • Stiff aluminum spider provides the power you want, and won't flex
  • Dual-sided ramp guides elevate smoothness and speed in shifting
  • Compatible only with Shimano's Microspline freehub
  • Item #SHIU18U
Cog Sizes
[10-45t] 10, 12, 14, 16, 18, 21, 24, 28, 32, 36, 40, 45, [10 - 51t] 10, 12, 14, 16, 18, 21, 24, 28, 33, 39, 45, 51
Cog Material
[outer cog] aluminum, [11 inner cogs] steel
Claimed Weight
[10-45t] 1lb 2.1oz (513g), [10-51t] 1lb 2.8oz (534g)
Manufacturer Warranty
2 years

What do you think about this product?


Selecting an option will reload the available reviews on the page

Sorry, we don’t currently have any of those types of reviews for this product.