Cassette 12 Speed SunRace MZ903

SunRace MZ903

The SunRace MZ903 is a high-performance 12-speed cassette engineered for riders who demand a wide gear range without compromising on durability or compatibility.

Ideal for mountain biking, gravel adventures, and aggressive trail riding, the MZ903 offers smooth, responsive shifting across a broad 1151T spread, helping you tackle everything from steep climbs to fast descents with confidence.

Built to fit standard Shimano HG freehub bodies, this cassette offers a practical alternative to Micro Spline systems, making it a popular upgrade option for riders looking to convert their existing hubs to 12-speed drivetrains.

• Speeds: 12-speed
• Total Gear Range: 464% for excellent climbing capability and flat-terrain speed
• Freehub Compatibility: Standard Shimano HG (HyperGlide) 9/10/11-speed freehub bodies
• Drivetrain Compatibility: Compatible with Shimano 12-speed chains and derailleur systems
• Steel Sprockets (11T39T): High-strength steel provides lasting wear resistance for high-mileage use
• Aluminium Sprockets (45T & 51T): Lightweight 7075-T6 aluminium used on the largest cogs to reduce weight without sacrificing strength
• Alloy Spider & Lockring: Keeps the overall construction lightweight and rigid for efficient power transfer