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RotorUNO 11-Speed Cassette


Item # RTR002W

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  • Black/Silver, 11-28T ($349.00)
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Item # RTR002W


Rotor's new Uno groupset has been enjoying a lot of attention for its 100% hydraulic approach to shift and brake actuation, which is every bit as iconoclastic as the brand's signature oval chainring shape. The Uno 11-Speed Cassette, by contrast, is slightly more traditional; however, it does depart from the status quo in some pretty significant ways. First, it's comically light. With a paltry claimed weight of 149g for an 11-28t model, the Uno's cog cluster is lighter than any cassette from the big three road component manufacturers.

While Rotor doesn't make specific claims to this effect, we're assuming that the secret to the low weight lies in machining (the Spanish brand's specialty) and material choice. Rotor opts for a mix of aluminum for the larger cogs and steel for the smaller ones, shaving weight where it won't impact durability by using the softer metal on cogs where there're more teeth to bear the load. The aluminum teeth also enjoy some Iberian flair courtesy of Rotor's graphical branding, which is the other significant departure from tradition. It may not be for everyone, but the branded granny gears really tie the drivetrain together when paired with similarly branded Q-rings up front.

Every bit of the cassette is shaped, milled, and polished at Rotor's Spanish headquarters, a rarity in today's outsource-heavy industry. The cogs are also treated with a friction-reducing finish before rolling out of Spain. Though it's lighter than its Italian, Japanese, and US competition, Rotor claims that the Uno Cassette is still compatible with all three. The unique machining that is done on the Uno Cassette even pushes a step further to add compatibility to 10-speed Shimano freehubs, making upgrades to your drivetrain that much easier.

  • A cassette for the gram-conscious racer
  • Lighter than top-tier models from the big three
  • Mixed material construction balances weight and durability
  • Reduced friction keeps the chain gliding smoothly
  • Three part construction for easy post-cleaning reassembly
  • Every cog machined at Rotor's Spanish headquarters
  • Compatible with 10-speed Shimano freehubs

Tech Specs
Cog Sizes11, 12, 13 ,14 ,15 ,16 ,17 ,19, 21, 24, 28t
Cog Material[24, 28t] 7075 aluminum, [11 - 21t] steel
Recommended Usecycling
Manufacturer Warranty2 years

Actual Weight

Black/Silver, 11-28T

Claimed Weight

Claimed weights are provided by the vendor.

Have questions? Chat with a Gearhead

[11 - 28t] 149g

Actual weights are measured in-house by the Competitive Cyclist team.

Have questions? Chat with a Gearhead

What do you think about this product?


>Rating: 5

Lightweight and Reliable

I've put it through the wringer

This is a great 11/28 Speed cassette , have it on my Sram 22 - 11 speed setup with a front Carbon Rotor chainring 53/39 and it's been flawless. Doesn't skip and is very quite. I can honestly recommend if your looking for other options besides Red or Shimano. Don't understand the bad review just because client could not use it on a 10 speed. It said clearly that is for 11 Speed setups.

>Rating: 2

Doesn't fit 10 speed cassette body

I bought this product hoping to upgrade a set of Topolino wheels bought back in 2010 using a SRAM 10 sp cassette but it seems to be a little to narrow to slide over the body. I don't know if the wheel design is older thus wider, the wrong type (campy) was sent or there is a product defect in this particular batch. Shucks! It looks great - single piece design and those funky outer cogs. Am I missing a trick or am I in over my head?

Hey Timothy, the HG freehub is pretty standard, so it should slide on. Feel free to email and we can walk you through it.

>Rating: 5

Solid lightweight cassette option

I've put it through the wringer

Been running this for the past 6 months on weight weenie build. Cassette is a little louder than say a Dura-Ace or Red22, but overall performance is on par, and shifting is not compromised with the weight reduction. Weighed 2 cassettes now and both came in right at 133.9g with included lockring. Solid cassette option for anyone looking for a lighter option, and works with both 10 and 11 speed freehub bodies.

Looking for an honest review on this product. What say you good sir?