SunRace MZ6 12-Speed MTB Cassette, Silver/Black, HG-Spline, 11-51T

• Wide-Ratio 12-Speed Cassette (11-51T) – Offers a broad gear range suitable for gravel, e-bike, and MTB applications. The 11-51T spread provides excellent climbing capability and smooth cadence control on varied terrain
• Steel Spider & Alloy Lockring – Sprockets are mounted on robust steel spiders for added stiffness, while the alloy lockring ensures secure installation and consistent performance under load
• Advanced Material Composition – Features A7075 aluminium for the largest sprockets (39T, 45T, 51T) and high-tensile steel for the remaining sprockets, combining lightweight performance with long-term durability
• Lightweight Design – Despite its rugged build, the cassette maintains a competitive weight, making it suitable for performance-focused riders who demand durability without excess mass
• Shimano HG-Spline Compatibility – Designed to fit standard Shimano HG freehub bodies, for use with 12-speed drivetrains

Engineered for riders who demand smooth transitions and dependable performance, this 12-speed wide-ratio cassette delivers the range and reliability needed for everything from steep climbs to fast descents. Whether you're upgrading your drivetrain or building a versatile setup, it’s a solid choice for gravel, MTB, and e-bike applications. Key Features: Wide-range gearing options for versatile riding Fluid Drive Plus for seamless gear transitions Compatible with standard Shimano HG 12x freehub bodies Durable construction with a clean, metallic finish Technical Specifications: Material: A7075 39-45-51T sprocket, steel spiders, alloy lockring Speeds: 12-speed Freehub compatibility: Shimano HG 12x Weight: 540g
Item Length: 214
Part Type: Bike Spares
Size: ‎11-51T
Type: Cassettes & Freewheels

Material: ‎Alloy Steel

UK Delivery:

• Free delivery on all orders of £10 or more.
• £1.49 delivery fee on orders below £10.
• UK orders are shipped via Royal Mail 2nd Class.

International Delivery:

• Flat rate delivery charges vary by country.

Dispatch and Delivery Times:

• All orders are shipped from our warehouse in Northampton, UK within 48 hours of receipt during working hours.
• UK mainland orders typically arrive within 3-5 working days via Royal Mail 2nd Class.
• International estimated delivery times:
• Europe & Channel Islands: 7 to 10 working days
• USA: 7 to 15 working days
• Rest of the World: 9 to 21 working days

View our full delivery infomation here.