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Dura-Ace CS-R9100 11-Speed Cassette
Shimano's groupsets often often miss call-outs for European elegance or relentless pursuit of weight loss at all cost and innovation for innovation's sake, instead earning their loyal following through the incredible dependability and meticulous engineering of the Dura-Ace CS-R9100 11-Speed Cassette. 9100 isn't a typo there, it is, in fact, a newly reworked version of Dura-Ace. When the brand introduces a new groupset, you can be sure it's actually boasting improvements you don't have to be Porte or Stannard to detect on a routine Sunday in the saddle.
The latest release of Dura-Ace 9100 delivers subtle, thoughtful tweaks to an already intelligent collection of moving parts, retaining the romance of mechanical shifting that's becoming less common each year. The cassette adds new combinations of gearing options, including expanded options for gearing appropriate to rouleurs, climbers, and the puncheurs who demand the best of both worlds. Shimano saw no need to improve the cassette's feathery construction, trusting the same proven combination of titanium and nickel-plated steel cogs and an alloy and carbon carrier that Dura-Ace 7900 introduced two generations ago.
Since Dura-Ace is the top-tier drivetrain in the Shimano road lineup, you might be surprised that only the largest five cogs are titanium. That's because—though it's lighter—titanium is generally more prone to wear than nickel-plated steel, and the smaller cogs are more prone to wear than the larger. Because of these material properties, Shimano only uses titanium where the softer metal doesn't create a significant negative impact.
- Ride with more intuitive gearing on this improved cassette
- Precisely machined cogs balance weight and durability
- Carbon and alloy carrier blends low weight and strength
- Item #SHI00DQ
What do you think about this product?
August 27, 2019
Pairing this with my Mercury S5's for the upcoming Peter Sagan ROADIE-OH Gran Fondo. It fit nicely on the wheels and shifts perfectly.
August 23, 2019
I have multiple of these cassettes on several bikes and they are great. No creaking, no issues, nothing.
June 6, 2019
I bought 11-28 to Gucci my cassette, but it creaks like hell! ruined all my rides. my bike sounded like a cheap-walmart-bike with all the creaking noises. so i had to return back my old cassette.
May 24, 2019
Backcountry + Shimano <3
Kind of a split review between Backcountry and Shimano. I bought a DA cassette almost 3 years ago. I was riding a week ago and noticed that one of the rings detached from the spider. Not great, but I ride and race A LOT (12k miles last year). Contacted backcountry with a picture of the problem, fully expecting there was nothing they could do, but it was within Shimano's warranty window. Shimano replaced the cassette and backcountry 2-day shipped it. Not to up sell you but if there's any doubt of ultegra vs dura ace, I think the warranty is worth it. Also shout out to Jeremy for handling the return and his quick response!
November 25, 2018
Bought both the 11-28 and 11-30 for a race with 20% pitches. Used the 11-28 on race wheels worked great. Flawless shifting with Di2. Routinely use the 11-28 on training wheels.
May 26, 2018
Poor piece of kit
Core has plastic NOT carbon fibre, hence why it breaks. Truth is the carbon spider thing is a marketting gimmick that breaks the truth test- and literally. Cogs attached to it flex and bend resulting in bad unintented torque drops under load, DING! The wide 5.8mm Shimano chain catches adjacent cogs. Even the 5.3mm Campy, which runs silent, will still bend this plastic mounted cogs, and drop under high load. Spacing is inexistant, and the metal is poor quality. Just several levels below the Campy XG-1190 - on one bike I have had one for 14,000 kms and it is still flawless. As it is well documented, the inner core does snap under load, tying the cyclist forever with Shimano back and forth. For a true solution to this cassette, check pics: SRAM XG-1190, Campy chain, and the new Shimano RD9100. No DA cassette, no Shimano cables. System runs powerful, silent, never grinds drops or catches. In the picture, the cassette has 14,000 kms and just replaced it. Now, if driven at 27-30km hr max, with slow climbing, it might pass the test. But 30-50km/hr with acceleration, it fails
May 26, 2018
A poor piece, poor metal / plastic core
Core has plastic NOT carbon fibre, hence why it breaks. Truth is the carbon spider thing is a marketting gimmick that breaks the truth test- and literally. Cogs attached to it flex and bend resulting in bad unintented torque drops under load, DING! The wide 5.8mm Shimano chain catches adjacent cogs. Even the 5.3mm Campy, which runs silent, will still bend this plastic mounted cogs, and drop under high load. Spacing is inexistant, and the metal is poor quality. Just several levels below the Campy XG-1190 - on one bike I have had one for 14,000 kms and it is still flawless. As it is well documented, the inner core does snap under load, tying the cyclist forever with Shimano back and forth. For a true solution to this cassette, check pics: SRAM XG-1190, Campy chain, and the new Shimano RD9100. No DA cassette, no Shimano cables. System runs powerful, silent, never grinds drops or catches. In the picture, the cassette has 14,000 kms and just replaced it.
December 19, 2017
This thing belongs in a jewelry box or on display under glass. I am floored by the quality of this cassette. Update: I have now put several thousand miles on this cassette; still a 5 star in my opinion, love it. Smooth and incredibly precise shifts. Lighter weight. Awesome!
November 24, 2017
Wish I would have known sooner.
I have 4 11 speed bikes, 2 are Campagnolo super record and 2 are Sram eTap, after spending way to much money on Campy and Sram cassettes I accidentally found out the best shifting, best gear ratio (same ratios as Campy except Shimano gives you a 28 to Campagnolo`s 27 and Sram starts to triple the big sprockets way to early), quietest running, almost the lightest (Sram is a bit lighter) cassettes you can buy and they are the least expensive by far. half the money of the Campy SR. a quality source told me this 2 years ago and I arrogantly didn't listen.. da
November 12, 2017
It goes to 29
I bought this DA cassette trusting Shimano's unwavering quest for quality. On that, Shimano never disappoints. Now I can run my 50/34 chainring and have plenty of gears to spin up the climbs around Park City. Guardsman, here I come.
October 18, 2017
2017 S-Works Tarmac eTap. On a tech’s suggestion, I ditched my SRAM Red cassette for the Dura Ace. Immediately solved noise and occasional hung shifts. 300 miles in. Drivetrain is whisper quiet and rock solid now.
May 17, 2017
Works great on my Shimano, sram and campy groupsets. Great fit travel to the mountains
May 11, 2017
Replaced my Ultegra
I decided to go with the size 12-28 to replace my ultegra cassette and I am shocked by how much better this Dura-Ace cassette is in comparison. The sizing is better and the shifting is smooth. Finally, I was impressed how cool the packaging was too!
May 8, 2017
Same Shimano Quality
The 9100 cassette carries the same Shimano quality we all have learned to expect. Switched from an 11-28 to this 12-28 and am very pleased. The marginal amount I have lost on the top end has been greatly outweighed by the addition to the 17 tooth in the middle of the block.
February 2, 2019
Hello, I’m currently running 52/36 front and 11-28 rear. Dura Ace 9100 rear derailleur. Can I simply change out rear cassette to a 11-30 without need to a new chain or links? Thanks, P
February 4, 2019
Two teeth won't make a difference unless your current chain is already sized short?
May 24, 2019
Yes. Did that. The chain for 11-28 and 11-30 should have 108 links. So you are safe. HOWEVER you need to readjust your rear derailleur (piece of cake).
January 18, 2017
I have Dura Ace 9000 11 Speed Derailer with 11-28 CS9000 cassette. Will this 11-30 R9100 cassette work with my current derailer?
May 8, 2017
I have the same question but also have the DI2 shifter. Just got off the phone with Shimano. The new 30 tooth gear is too big for the existing derailleur
June 5, 2017
no max size for the 9000 is 28 teeth
September 20, 2017
Actually, yes it will, but Shimano won't back it up, so the official answer is no. Researched this a couple places (Lennard Zinn for example) as well as talking to a friend who is currently running the 11-30 set up and it works fine. Zinn recommends adding a link to your chain, and maybe adding a turn or two to the B spring adjustment screw to keep it quiet in the 30 cog. And don't cross chain!