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Your cart is empty.Ultegra might be the heart and soul of Shimano's line, and while we appreciate the precision, weight, and performance that goes into Dura Ace, we find Ultegra to be the perfect sweet-spot in the price-to-performance ratio. Shimano has created gear ranges in the Ultegra line for the most elite road cyclists to gravel grinders, and everything in between, so riders can achieve the sweet Ultegra feel no matter what they ride. In this particular iteration, Shimano creates the Ultegra CS-HG800 Cassette to fit on a mountain bike hub, so those running big touring setups or cross-bikes can now run the smooth shifting feel of Ultegra, and with the huge 11-34 tooth range you won't have issues finding the sweet spot to pedal your way through any adventure. Shimano's experience in machining and engineering allows for exceptional amounts of technology to go into tooth design, shaping, and shifting ramps. Made from nickel-plated steel, the cogs themselves withstand corrosion and are tough enough to hold up to abuse, which leads to a cassette that stays smooth shifting and precise for longer than before. By opting for nickel-plated steel, it does add a bit of additional weight, but allows for a price that's much friendlier to those of us who have to shovel out our own cash for components. To increase stiffness and improve shifting, Shimano groups the top five cogs as three and two, and rivets them to anodized aluminum spiders that add strength. The remaining six cogs remain as individuals, along with spacers between them, and a lock ring made of anodized aluminum to screw into your freehub and hold the assembly together snug. True to Shimano's Japanese culture--which has a name, poka-yoke, for built-in preventions of user error--one spline of the cassette is wider than the others and corresponds with the splines on the freehub, so the cassette cogs can only be installed with the right clocking of the shifting ramps, timing them for perfect chain pick-up and release. The CS-HG8...
Hari
Reviewed in Germany on February 20, 2025
Ersetzt meine bisherige 11fach Kassette 11/28 am Rennrad mit Shimano Freilauf. (Ultegra DI2-Gruppe). Fazit: etwas mehr Spielraum bei Bergfahrten.
tsnow
Reviewed in Japan on September 26, 2024
お陰様で、坂道でぶつぶつ言われ無くかなりましたゆっくり楽に登坂出来るので良かったと言ってます
IlClod
Reviewed in Italy on December 18, 2024
Acquistato per un doppio treno di ruote per la bici gravel
Michael SN
Reviewed in the United States on October 10, 2024
El producto es exactamente el esperado
Cliente de
Reviewed in Mexico on April 25, 2024
Excelente calidad, shimano en empaque original, llego dos días antes de lo previsto, excelente servicio
Mohammed Alzubaidi
Reviewed in the United States on July 17, 2023
Good gear ratio
ST
Reviewed in Australia on December 18, 2023
Upgraded from 11-28 to 11-34 has made riding those steeper climbs just a little bit easier
Bicyclemanoferie
Reviewed in the United States on August 11, 2020
Amazing! With my deore xt and my 1x. This is absolutely flipping amazing!
fuel98rider
Reviewed in the United States on March 30, 2020
Perfect cassette to match the medium cage Ultegra derailleur. I built my Di2 system with this in the rear to give me a 1:1 ratio for better hill climbing. This shifts perfectly when matched with an Ultegra chain and my Quarq crank. Should last a long time.
Stephen D.
Reviewed in the United States on November 28, 2020
Local bike shop was out, so I ordered this. OEM so it did what I expected. No issues. A learning experience for me on the plastic sleeve, I took it off and the sprockets and spacers went everywhere. Looked after the fact at some YouTube videos and they show you how to unlock the sleeve and with the cassette still on the sleeve it is easy to slide them on the rear hub. Recommend keeping the plastic sleeve should you ever need to remove the cassette.
Crypto Que
Reviewed in the United States on April 16, 2019
I bought this cassette after learning that the Ultegra RX will accept a 34t cog. I switched to a 46 1x up front to take on some local hills & this cassette keeps me spinning, seated for longer, and downshifts easily so I can get back on the gas toward the summit. Although this was a last min. purchase it was definitely worth it.Pros: More gears, light for 11 speedCons: 12 & 13 speed cassettes are out now
Dani
Reviewed in the United States on September 29, 2018
Just the right ratio of gearing I needed. Just be aware that you may get some clicking noise while in the 27t (3rd largest sprocket) when in your large chainring up front. This is due to the chain catching some of the 25t sprocket. Others have had this problem but it’s not bothering me.Solution to clicking: This was happening to me as well and at first it didn’t bother me - until it did. I eventually swapped my 11-speed chain for a 12-speed and that silly little .1 mm kept it from catching and snapping.
Brady
Reviewed in the United States on March 18, 2018
Ordered the 11-34 because it will work with Shimano 11 speed road shifters but can use a normal 10 speed wheelset. ONLY THE 11-34 will work like this. Besides all the well known qualities of Ultegra items, the compatibility feature is awesome since 11spd mountain and road standards are different now. You can run beefier MTB wheels for a gravel or cross build but maintain road drivetrain compatibility using this cassette.
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