- Shimano Dura Ace 7900 10 Speed Cassette
Shimano Dura Ace 7900 10 Speed Cassette
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Super lightweight 10-speed cassette with a rigid alloy carrier for excellent shifting even under the most demanding gear changes.
Top Features of the Shimano Dura Ace 7900 10 Speed Cassette
- Close ratio gearing allows a more efficient use of energy through finer cadence control
- Largest sprockets are mounted on a lightweight alloy carrier to reduce weight and increase rigidity
- 4 largest sprockets are made from titanium to reduce weight without sacrificing strength
- Sprockets are extensively cut away and drilled to further reduce weight without reducing rigidity
- Nickel-plated finish offers hard wearing resistance to corrosion
- Alloy cassette lockring
- For Super Narrow 10-speed HG chains
- Weight: 163 grams for 11-23 tooth
Hyperglide sprockets have a computer designed tooth configuration with contoured shift gates, resulting in a crisp smooth shift even under load.
About Cassettes & Freewheels
Cassettes and freewheels for bikes are a cluster of sprockets in a range of sizes offering a multitude of gear ratios. The difference between the two is, a cassette slots onto the freehub, which has the ratchet built in and is then secured with a lockring, whereas a freewheel is a cluster of sprockets built around a ratchet and threads directly on to the hub. Cassettes and freewheels come in many ratios, close ratio is when the number of teeth increase in small increments of 1 or 2 at a time, whereas a wide ratio is when the teeth increase in larger increments of 3 or 4 at a time. Most systems will use a cassette hub as these allow for a wider bearing spacing and increased axle life, you can also fit a larger quantity of sprockets onto a cassette hub with 11 speed systems now becoming available. With cassettes you must use the appropriate spacing for your gear levers and rear mech, Shimano and Campagnolo are not interchangeable so you will need to match the cassette to your levers for smooth and precise shifting. Sram and Shimano chains and cassettes will work together as they use the same spacing.
About the Shimano brand
Shimano are the makers of the world's most well known cycle component brand. Established in 1921 when the first cycle freewheel was forged. Shimano produce drivetrains, wheels, pedals, shoes, cycling clothing and pretty much every Shimano cycle accessory you can think of! Famous for their top end products ridden by the pro's, Dura-Ace and XTR, which cover both road and MTB's. At Shimano, they're doing everything they can to respond to heightened environmental concerns. Shimano are proud to be a producer of bicycle components that help people to enjoy outdoor sports and interact with nature through healthy non-polluting activities. In their 87 plus years of existence Shimano have accumulated a wealth of technology and product development and expertise that serves as the driving force behind their continually evolving product line.
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Magazine reviews for Shimano Dura Ace 7900 10 Speed Cassette
Review from Bikeradar
The largest three cogs on the new Dura-Ace cassette are supported by a separate cold-forged aluminium alloy carrier, as are the next two sprockets.
This increases stiffness and reduces weight - as does the fact that the largest four cogs are made from titanium. All this means that the cassette weighs in at a paltry 185g.
Shifting performance up and down is almost always smooth and positive, although sometimes the transitions are so smooth you catch yourself wondering whether it has changed gear at all.
The cassette is available in eight different sizes: 11-21t, 11-23t, 11-25t, 11-27t, 11-28t, 12-23t, 12-25t and 12-27t.
Reasonably hard wearing and fairly light too
Product Q & A
Ask your questions and share your answers.
So 12-27 has 12 teeth on the smallest cog and 27 on the largest, logically 11-28 has 11 teeth on the smallest cog and 28 on the largest. Detailed info regarding the spread of gear ratios (the number of teeth on the cogs between the smallest and largest) can be found on the Shimano website
I don't think you'll have any problems though I personally don't see what the big deal is with dura-ace cassettes.
I will sound two words of warning:
1. If you have not previously fitted an 11-28, then the rear derailleur needs to be a RD-6700-SS* (rather than a RD-6600) to be certain of sufficient capacity. With a 6600 you are exceeding the official spec, thus it is possible for the jockey wheel to bump on the cassette, depending on the shape of your derailleur hanger.
2. The Dura-Ace 7900 cassette, although lighter, is much less durable the the equivalent Ultegra 6700 cassette because titanium (used for the top cogs) is softer than steel. It shifts identically with the Ultegra, so I recommend only using Dura-Ace cassettes for race day and recreational riding or training on Ultegra cassettes.
* Yes, use the SS. The GS is for when you have a triple on the front.
gear,,is the 7900 a replacement for 7800
Is it possible to buy the spare - the part number is Y-1YZ 98070 (11-25 cassette).
It also depends if you want to spin or if you prefer to grind a low cadence. The shorter the range the closer your ratios, thereby allowing more precise management of your cadence. This can be a plus or a minus depending on the individual and what the effort is trying to achieve: sometimes a bigger gap is good as you can spin up and choose the next cog then use the higher leg speed to push the pace up; sometimes this will make you feel like dying. Generally closer gears are better on flatter courses. There are always trade-offs.
FYI - I use 11-23 on all all distances where the climbs are less than 5km and 5% or less
I use 11-27 on rides where there are multiple long (over 5km) climbs and the gradients are over 5%.
If insufficient, try triple crank (I have never tried that).
The key is the rear derailleur. That should be compatible with the STI and the rear sprocket in use.
Yes, you need a Shimano lock-ring tool, and preferably a torque wrench as well to get the tightening just right. If you do not have these, perhaps best to take it to a shop to get it done right.
There is a tool for tightening the nut which you can buy here and in bike stores.
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