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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
Bottom Line:
When it’s Dura-Ace, it doesn’t change until it gets better.
The Dura Ace 7950 compact cranks are so expensive . . . anyone
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
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.
I am getting ready to ride a very hilly century ride in northern
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
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...
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.
Is the Dura Ace CS 7900 or the Ultegra 6700 compatible with an
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.
Got another question: What is a good cassette gear size to use
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.
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.
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.
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.
When installing this on a Mavic 10 speed free hub, do you have
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?
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!
When installing this on a Mavic 10 speed free hub, do you have
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?
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 ALC8.And so far
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!
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.
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