Specifications Hign-concerned Chemical:None Model Number:CS-R9200-12 Sensitivity:108 Sounds Flywheel Adjustable Gear Number:12Speed Material:Alloy Gear Teeth:11-30T Freewheel Speed:12 Origin:Jp(origin) Components:Freewheel The Dura-Ace CS-R9200 12-speed Cassette The CS-R9200 is the first cassette from Shimano's top road series Dura-Ace to have 12-sprockets. Since five or six tooth rings are made of titanium, depending on the grade, this can save up to 90 grams of weight compared to the Ultegra model. The cassette is characterized by Hyperglide+ technology, which was first tested in the MTB sector and ensures seamless shifting even under high load. You can change gears safely and immediately, even when weighing or sprinting. The gradations have been selected in such a way that in all situations a high gait efficiency results and you accelerate optimally. The enlarged teeth of the pinion also contribute to this. The CS-R9200 not only fits on the new 12-speed freewheel body, but can also be used with conventional Road freewheel bodies. Use:Road, Triathlon, Time Trial Series:Dura-Ace R9200 Material pinion:Steel, titanium Speed:12-Speeds Chainring:11-30T,(11-12-13-14-15-16-17-19-21-24-27-30T) 11-34,(11-12-13-14-15-17-19-21-24-27-30-34T) Weight:Approx 223g(11-30T),253g(11-34T) Recommended chain:HG 12-fold (e.g. CN-M9100) Compatibility: Road, Road 12-speed Compatibility: Shift/brake handle: ST-R9250, ST-R9270, ST-R7170, ST-R9160, ST-R9180, ST-R8150, ST-R8170, ST-R8060 Rear derailleur: RD-R9250, RD-R8150, RD-R7150 (11-34 only) Chain: CN-M9100, CN-M8100, CN-M7100, CN-M6100 Features: Hyperglide+ technology for fast, seamless shifting at maximum pedal load Sophisticated 12x gradation and larger teeth for superior efficiency and optimum acceleration in all situations Compatible with 12-speed and 11-speed road freewheel bodies Tech: Hyperglide+.HG+ Hyperglide+ is the efficient further development of Shimano's Hyperglide system. These are climbing aids and specially shaped pinion teeth that make shifting to larger or smaller pinions softer, smoother and quieter. The system of small rivets attached to the side of the sprocket and milled or pressed ramps ensures that the chain is already taken by the next sprocket during the shifting process before it leaves the previous sprocket. Optimized for faster shifting and shifting under load, Hyperglide+ combines with a compatible HG chain for more efficient chain binding, holding force and power transmission. The shifting time is reduced to one third compared to the Hyperglide and the pedal stroke is noticeably reduced. HG+ enables a completely new chain stability and thus offers a safe driving experience.