Product overview A durable, lightweight mountain bike cassette designed for reliable shifting and broad compatibility. Constructed from high‑strength steel with a nickel‑chrome coating and a hollowed design to balance strength and weight, it provides a cost‑effective upgrade or replacement in the mid price segment. Key benefits (why you need it) - Durable and corrosion resistant: high‑strength steel plate with nickel‑chrome coating resists wear and rust for longer service life. - Lighter, quieter ride: hollow‑out design reduces weight and drivetrain noise, making pedaling easier and smoother. - Precise, reliable shifting: special tooth profile and tapered teeth give fast, accurate indexing and consistent gear engagement across the range. - Easy fit and maintenance: high‑precision HG female thread ensures a secure connection to HG hubs, smooth rotation, and straightforward maintenance. - Wide model range: available in 8–13 speeds and multiple ratios to match different bikes and riding styles. Features and specifications - Material: high‑strength steel plate with nickel‑chrome coating. - Design: hollow‑out construction for weight reduction and quieter operation. - Threading: high‑precision HG female thread for firm hub connection and smooth rotation. - Tooth profile: specially shaped teeth and tapers for fast, accurate indexing and precise gear positioning. - Speed options: compatible models for 8, 9, 10, 11, 12, and 13 speeds. - Gear ratios: available in 11-30T, 11-32T, 11-34T, 11-36T, 11-40T, 11-42T, 11-46T, 11-50T, and 11-52T. - Compatibility: fits Shimano and SRAM drivetrains; compatible with HG hubs. Not compatible with SRAM XD freehub bodies. What’s included - Mountain bike cassette. - Cassette installation tool. - Bicycle rear derailleur hanger extension (included except for cassette models with gear ratios up to 11-40T, in which case the hanger extension is not provided). Practical applications (use scenarios) - Trail and enduro riding: Choose a wider ratio (e.g., 11-42T to 11-52T) for steep climbs and long descents to keep cadence steady across changing terrain. - Cross‑country and fitness rides: Lighter hollow design and close ratios (e.g., 11-30T to 11-36T) improve pedaling efficiency and responsiveness for longer efforts. - Replacement or upgrade for mixed gravel/commute bikes: Durable nickel‑chrome surface and accurate indexing make this cassette a reliable choice for daily use and occasional off‑road riding. Installation and maintenance notes - Install using the included cassette installation tool; the HG female thread ensures a secure fit on HG hubs. - If your bike uses a SRAM XD freehub body, this cassette is not compatible. - The rear derailleur hanger extension is omitted for 11-40T and smaller maximum sprocket models—verify included accessories when selecting your gear ratio. - Regular cleaning and lubrication of the drivetrain will extend life and keep shifting precise. Choose this cassette if you want a cost‑effective, durable, and lightweight solution that delivers smooth, accurate shifting across a wide range of speeds and gear ratios while remaining compatible with common Shimano and SRAM systems (excluding XD).