Shimano Ultegra HG-800 11 speed Cassette

The Shimano Ultegra HG800 race cassette is a durable choice with the largest possible amount of teeth possible in combination with a long cage Shimano Ultegra R8000, 105 R7000, GRX RX-810 or GRX RX-815 Di2 rear derailleur.

Great finish
This cassette has a somewhat better finish than the R8000 Ultegra cassette. For example, the CS-HG800 is more corrosion resistant than the CS-R8000, so it's better suited to off-road use. Plus, the HG800 is a little heavier than the R8000 version, but doesn't compromise on quality. In all, this lightweight cassette is ideal for long climbs, while barely sacrificing any of its properties suited for long, flat roads.

Cassette's width:
The 11/34 gear ratio cassette is the same width as a 10-speed mountain bike cassette. Plus, the umbrella-shaped spider also fits over a 10-speed mountain bike freehub body.

• Number of individual components: 9
• Material: nickel-plated steel
• Spider: Aluminium
• Cogs on the cassette: 11-13-15-17-19-21-23-25-27-30-34
• Weight according to Shimano: 335 grams
• Cassette comes with an 1.85 mm spacer.

• For other gearing look at the Ultegra R8000 11 speed cassette.

This cassette is compatible with:
- Ultegra R8000 long cage derailleur (RD-R8000 GS, RD-R8050 GS)
- 105 R7000 long cage derailleur (RD-R7000 GS)
- GRX RX-810 11-speed Rear derailleur
- GRX RX-815 Di2 11-speed Rear derailleur

Mounting with special tools
To assemble and disassemble this cassette you'll need specific cassette tools. These can be found here.

Don't forget the assembly grease!
The lockring of your cassette can be well tightened, in some cases up to 40 Nm. To make removing the lockring in the future easier, we recommend lubricating it with a bit of assembly grease. You can find our selection of assembly greases here.

How often should I clean my bike? Regular cleaning ensures that your materials last longer, so you'll be able to enjoy cycling for a longer time. How often you'll need to clean your bike depends on the weather conditions in which you ride. Do you cycle through all kinds of weather, or do you only go out when the sun is shining? It all affects the degree of wear and tear and some people will have to clean their bikes more often than others. Use the schedule below as a guide:

October to March:
• Clean every 200 km
• Rinse after every ride
• Dry and oil the chain after every ride
• Allow the bike to dry at room temperature

April to September:
• Clean every 300 km
• Rinse off after cycling in the rain
• Dry and oil the chain after polishing or rinsing
• Allow the bike to dry at room temperature

What's the difference between an HG800 and an R8000 cassette?
There are two cassettes, with two separate product codes, listed on this page. These two cassettes are part of the same groupset and are of the same quality. However, there are differences in their range and compatibility.

The CS-R8000 cassettes are available with ranges between 11/25 and 11/32, and fit a Shimano HG 9-12 speed body. The CS-HG800 cassette is available with an 11/34 range, and is just as wide as a 10-speed mountain bike cassette. It'll fit on an HG 9-12 speed freehub body as well as a 10-speed mountain bike freehub body.