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Shimano Dura-Ace CS-7900 Cassette

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Item # SHI0152

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Item # SHI0152

Description

When it’s Dura-Ace, it doesn’t change until it gets better.

The Shimano Dura-Ace CS-7900 cassette provides you with a wealth of gearing options unlike any previous generation of Dura-Ace. You get an unprecedented 8 different ratios to choose from -- 11-21, 11-23, 11-25, 11-27, 11-28, 12-23, 12-25, and 12-27. The low 6 cogs are steel, and the high 4 cogs are made from titanium. Compared to the CS-7800 cassette, you get a weight savings of 10g (e.g. the 11-23 weighs 166g).

The backbone of the Dura-Ace CS-7900 cassette is its new aluminum carrier unit. Not only is it lighter than the CS-7800's, but it offers a measurable increase in rigidity for improved power transfer when you're putting the hammer down. In addition, Shimano did some re-engineering to the cog teeth profiles. They're fine-tuned to mate to the Dura-Ace CN-7900 chain -- giving you superior shifting on both up-shifts and down-shifts. You'll also experience added drivetrain efficiency since the inner plates of the CN-7900 precisely fit the cog teeth of the CS-7900 cassette. Lighter, stiffer, crisper -- you get improvements all around.

The Shimano Dura-Ace CS-7900 Cassette is compatible with the Dura-Ace RD-7900 rear derailleur and the RD-7800 rear derailleur except for 11-27 and 11-28 . The RD-7800 rear derailleur does not have ample chain wrap capacity to handle the CS-7900 in 11-27 and 11-28. These cassettes must be used with the RD-7900. The CS-7900 is optimized for the Dura-Ace CN-7900 chain, but it is compatible with the Dura-Ace CN-7801 chain.

Two brand-new ratios for Shimano with the Dura-Ace CS-7900 cassette are 11-25 and 11-28.

The 11-21 includes - 11,12,13,14,15,16,17,18,19,21
The 11-23 includes - 11,12,13,14,15,16,17,19,21,23
The 11-25 includes - 11,12,13,14,15,17,19,21,23,25
The 11-27 includes - 11,12,13,14,15,17,19,21,24,27
The 11-28 includes - 11,12,13,14,15,17,19,21,24,28
The 12-23 includes - 12,13,14,15,16,17,18,19,21,23
The 12-25 includes - 12,13,14,15,16,17,19,21,23,25
The 12-27 includes - 12,13,14,15,16,17,19,21,24,27

Tech Specs

Carrier Material:
aluminum
Claimed Weight:
163 g
Recommended Use:
cycling, racing

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Shimano Dura-Ace CS-7900 Cassette

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Here's what others have to say...

Unanswered Question

What is the difference in the ratios for...

What is the difference in the ratios for the dura ace speed cassettes? What is the difference between the 11-25 vs 12-28? How do you know which one is right for you? I live in Florida which is primarily flat with some small hills and I compete in triathlons. I have purchased a set of Profile Design Altair 80 wheels and I want to put on a new cassette. All my components on my Scott Plasma 10 TT bike are Dura ace and I need a recommendation for the cassette.

5 5

11-27 is a good range

  • Familiarity: I've put it through the wringer

I have the 11-27 on my bike and it gives me a pretty good range for climbing using a compact crank. It is also amazing how light the cassette is. I have about 4000 km on it and it still looks good and is holding up well.

5 5

Dura ace cassette

  • Gender: Male
  • Familiarity: I've put it through the wringer

Shimano quality yet again. No issues here

Dura ace cassette

The Dura Ace 7950 compact cranks are so...

The Dura Ace 7950 compact cranks are so expensive . . . anyone know if you can put the DA chainrings (50/34) on another crank (like a FSA carbon pro) that also has 110 BCD spacing?

I ask that because the rest of my gear train is all DA 7800

Responded on

You could, but why? Save the trouble and money and go with ultegra.. or 105.. or any crankset that suits your needs.

I am getting ready to ride a very hilly...

I am getting ready to ride a very hilly century ride in northern Georgia called "the Six Gap". It has 11,000 feet of climb, just climbing over the six gaps, and doesn't count the mountains in between, which I am told adds another 6,000 feet of climbing.
I am riding a Sram Red compact, Dura Ace derailers(no spellcheck), and a Sram 12/28 cassette. Can I use a larger cassette like 12/30 with the components I have

I am getting ready to ride a very hilly...
Responded on

yes, you shouldn't have a problem with going up to 30 tooth in the rear cassette with a Dura-Ace RD. With a compact crank you will have to be heading up some serious slope to really need it, unless you ride with Contador-style cadence on the climbs.

Responded on

You should be good, no need to move up to 30. I rode with a 11/28 last year and did fine. The real climb starts at mile marker 3 on Hogpen Gap, which is mile 68 of the ride. See you out there...

You should be good,  no need to move up to 30.  I rode with a 11/28 last year and did fine.  The real climb starts at mile marker 3 on Hogpen Gap, which is mile 68 of the ride.   See you out there...
5 5

Smooth

These cassettes have a great smooth feel to them just like the rest of the 7900 series drive train parts! Since they are so smooth together they are quite and seamless.

Is the Dura Ace CS 7900 or the Ultegra...

Is the Dura Ace CS 7900 or the Ultegra 6700 compatible with an 4 year old durace derrailer? No identifying marks on current derrailer, except the Dura Ace stamp.

Responded on

You should be fine there, as long as it is 10 speed.

Responded on

It is compatible if the derailleur is from before 2004 because before then Shimano was only making 9 speed.

5 5

SMOOTH AND QUIET

Shimano not only improved by cutting down Ten grams, but also is the quietest cassette on the peloton

Got another question: What is a good...

Got another question: What is a good cassette gear size to use for a hilly type area? I live in Santa Barbara, CA; climbing and hills are a part of every ride. I'm 5'8" at 160 lbs.

Responded on

That depends if you are using a compact crankset or a standard. If compact the 11-25 should be great, with a standard you may want to look at the 12-27.

Is the Dura-Ace cassette compatible with...

Is the Dura-Ace cassette compatible with the Shimano 105 gruppo?

5 5

Really smooth cassette

I've been training and racing with the CS-7900 for two race seasons. I push all my equipment to the limit, and I did the same with this cassette. It's always smooth and precise, regardless the conditions or wear.

5 5

The best!

Great cassettes, the best you can buy. I think I've used a ten speed dura ace 11-23 cassette for 5 years on and off for training. Keep it clean and it will last for a long time, and still be lighter than what you had before.

5 5

Shimano Cassette

This cassette is light, Ive used this type of cassette on all my bikes for 5 years! I highly recommend it for anyone interested in using Shimano

When installing this on a Mavic 10 speed...

When installing this on a Mavic 10 speed free hub, do you have to use the Mavic spacer AND the sapcer that comes with the cassette prior to putting the first cogs on the hub?

Responded on

You may not have to use it but it doesn't hurt. I've been fine with using the just the Mavic spacer and no Shimano spacer on some Mavic wheels. Bottom line, if you install everything and get the lock-ring tightened up and the cogs don't have any side to side play, then you're good!

Unanswered Question

When installing this on a Mavic 10 speed...

When installing this on a Mavic 10 speed free hub, do you have to use the Mavic spacer AND the sapcer that comes with the cassette prior to putting the first cogs on the hub?

Does anyone know if the 11-27 and 11-28...

Does anyone know if the 11-27 and 11-28 are compatible with the SRAM Red rear derailleur?

Responded on

The best answer you will get on this is "Probably" and until you see it don't believe it.

In reality they are several technical changes to the 7900 series so if you are running SRAM Red why wouldn't you just get the OG-1090 cassette in 11/28 size? It is just as light, lasts for more miles, and is cheaper than the CS-7900 cassette.

Hi,I'm building a 10-speed road bike for...

Hi,I'm building a 10-speed road bike for ALC8.And so far I've purchased the Ultegra Double Crank and Ultegra Shifters from you guys. Will this cassette be compatible? And What other parts should I get? Thanks in advance!

Responded on

Yes this cassette is compatible, but it seems pricy for the mix of parts you are starting with. AN Ultegra would save you lots of $$.....which you could spend on lots of extra cleats for your pedals, or at least some cleat covers! As a 2 time mechanic for the ALC I've seen rides ruined by a lack of cleats. A couple spare tubes would be cool too.