ZTTO SLR Gen3 12-Speed Super Lightweight Road Bike Cassette
The ZTTO SLR Gen3 sets a new benchmark for lightweight performance and precise shifting. Designed for serious road cyclists, it combines advanced machining, premium materials, and a refined tooth profile to deliver the smoothest, quietest, and most efficient drivetrain experience yet.
Ultra-Lightweight Design
Engineered with a unique hybrid construction — the largest three cogs crafted from 7075-T6 high-strength aluminum and the remaining from hardened steel — the SLR Gen3 offers exceptional strength while minimizing weight. Each size is precisely balanced for performance:
11-28T: 133g
11-30T: 137g
11-32T: 143g
11-34T: 162g
11-36T: 160g
These ultra-low weights help reduce overall bike mass, improving climbing efficiency and acceleration for competitive riders.
Gen3 Refined Tooth Profile
The latest Gen3 tooth design introduces a major evolution in both smoothness and noise control. Each cog is precision-shaped for flawless chain engagement and faster shifting response. The result is a drivetrain that feels crisp and silent, maintaining fluid power transfer across all 12 gears.
Seamless Compatibility with HGR Freehub
Built for 36.8mm HGR freehub standards — the same size as most 11-speed road hubs — the SLR Gen3 allows you to upgrade to a 12-speed setup without replacing your existing hub. Simply install and ride, enjoying modern performance with your current wheels.
Precision CNC Machining
Manufactured through high-accuracy CNC machining, every cog is cut to perfection to ensure optimal alignment, long-term durability, and minimal friction. This process guarantees professional-level consistency and reliability comparable to top-tier race components.
Performance, Durability & Quiet Operation
From its lightweight yet strong build to its smooth and quiet gear transitions, every detail of the SLR Gen3 cassette is engineered for high-performance road cycling. Whether sprinting on flats or conquering steep climbs, this cassette ensures efficiency, control, and long-lasting precision.

