Description
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 11–51T 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 (11T–39T): 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
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