Shimano Ultegra CS-HG800-11 11-34T

Wide-Range Versatility. Universal Hub Compatibility.

The defining mechanical feature of the Shimano CS-HG800-11 Cassette is its specialized hub carrier body. While it features an expansive 11-34T gear range typically found in the mountain bike world, it is physically designed to fit onto both standard 10/11Speed mountain bike freehubs and 11Speed road freehub bodies (using the included 1.85mm spacer). This universal design makes it a lifesaver for riders wanting to mount an ultra-wide road cassette onto durable, mountain-bike-spaced wheelsets for gravel or commuting.

Why the HG800-11 is an Endurance Favorite:

• Uncompromised 11-34T Climbing Range: Delivers a generous 34T bailout gear. When paired with a compact road or sub-compact gravel crankset, it unlocks a sub-1:1 gear ratio that lets you spin smoothly up loose, steep fire roads without bogging down.

• HG-EV Precision Tooth Profiles: Features Shimano’s hyper-engineered Hyperglide (HG-EV) tooth contours and shifting ramps. This geometry ensures that even under heavy pedaling loads or out-of-the-saddle climbing efforts, your chain glides instantaneously and silently between gears.

• Lightweight Aluminum Spider Carrier: The largest cogs are riveted to an anodized aluminum spider arm structure. This drastically minimizes weight, increases structural rigidity, and prevents the individual cogs from biting into soft aluminum freehub bodies.

• Optimized Cadence Progression: While providing a massive overall range, the cog steps are meticulously spaced (11-13-15-17-19-21-23-25-27-30-34) to keep your pedaling rhythm smooth and natural, preventing sudden drops or jumps in cadence.

• Robust All-Weather Durability: Built with nickel-plated steel cogs that resist corrosion, shed mud rapidly, and handle thousands of miles of heavy drivetrain friction under the most demanding outdoor conditions.

Technical Specifications:

• Series / Tier: Ultegra / GRX Level Performance

• Speed: 11Speed

• Gear Combination: 11-13-15-17-19-21-23-25-27-30-34T

• Freehub Body Compatibility: Fits standard Road 11Speed freehubs (with included 1.85mm spacer) AND MTB 10/11-speed freehubs

• Material Architecture: Nickel-Plated Steel Cogs with an Aluminum Spider Carrier

• Weight: ~335 grams

The Alegro Perspective: In the shop, we call the HG800 the "Swiss Army Knife" of 11Speed cassettes. It’s an absolute lifesaver if you are converting an older endurance road bike or a rugged urban commuter into a dedicated gravel machine. Because the back of the cassette is subtly dished, it can slide straight onto a standard mountain bike wheel or an older 10Speed road wheel, instantly upgrading your bike to a modern 11Speed system without forcing you to buy a new rear wheel. Paired with a clutch rear derailleur like a Shimano GRX, it runs beautifully silent over the roughest washboard dirt.

Sartorial Precision. Infinite Climbing Capability. Expand Your Horizons with Shimano.