Find Your Store
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

CS-M5100 Cassette

5 out of 5 stars
2 Reviews
Current price: $71.09 - $79.99 Original price: $99.99
Up to 20% off

Style & Size:


Why We Like The CS-M5100 Cassette

With a focus on gear steps to help maintain performance and maximum cadence control, Shimano’s CS-M5100 Cassette for 11-speed drivetrains keeps you churning the correct cog no matter the terrain. The wide gear range may postpone your drop-in for the 12-speed group a bit longer, as the M5100 is undoubtedly designed to be a dependable workhorse and a worthy weekend racer. With terrain specific options, the 42-tooth or 51-tooth, you can ride long tempo climbs or have bail-out, switchback crusher. And the 11-speed design still allows a fast downhill 11-tooth cog to motor back to the trailhead.


  • Eleven-speed mountain bike cassette for all-mountain epics
  • Range for tight cross-country racing or bail-out trail grinding
  • Designed for controllable gear jumps to minimize cadence changes
  • Shimano's components have reliable function and simplicity
  • Item #SHIU1CD
Cog Sizes
[11-42t] 11, 13, 15, 17, 19, 21, 24, 28, 32, 37, 42, [11-51t] 11, 13, 15, 18, 21, 24, 28, 33, 39, 45, 51
Cog Material
Freehub Type
Shimano HG
Carrier Material
1 lockring
mountain bike

Overall Rating

5 based on 2 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 0 reviews
3 Stars - 0 reviews
4 Stars - 0 reviews
5 Stars - 2 reviews

Fits True To Size

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

What do you think about this product?


Selecting an option will reload the available reviews on the page
5 out of 5 stars

April 10, 2023

Great addition

I've used it several times

I went through 2 Sunrace 11x50 cassettes in 4 years and was looking for a better option Until Shimano came out with this cassette the best they had was a 11x46 with a huge jump to the 46 This new 11x51 works great with my 1x XT 8000 drivetrain Just needed a tweak of the B screw Shifts are flawless and much better then the Sunrace Very happy

Thomas M

Originally reviewed on

5 out of 5 stars

May 24, 2021

11/51 cassette happy

I've put it through the wringer
Size Bought:
5' 10"

The 11/51 provides a wide gear choice. Makes the knees happy. Shifts are crisp and precise. You should run a steel freehub, as the cassettes splines will gouge a aluminum freehub, and ruin it. With steel freehub, no problem. The cassette holds up extremely well in all conditions. I run it on a Pivot Mach 429 trail, 2x11 drivetrain. Riding trails from Michigan to Colorado to Arizona. I have worn out 2 cassettes in 3 years, due to rocks in Utah and Arizona.

alan K