ZTTO 12-Speed 11-36T Road Bike Cassette, Ultralight Bike Freewheel 12s HGR Universal Spokets

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.

• 【Ultra-Lightweight Performance】 Achieve a smoother and faster ride with the ZTTO SLR Gen3 12-Speed Cassette. Designed for high-performance road bikes, this cassette combines lightweight precision with strength. Each size is optimized for minimal weight — 11-28T: 133g, 11-30T: 137g, 11-32T: 143g, 11-34T: 162g, 11-36T: 160g — giving you faster acceleration, better climbing efficiency, and overall improved control on every ride.
• 【Refined Gen3 Tooth Design】 Featuring the latest Gen3 tooth profile, this cassette significantly improves smoothness and reduces drivetrain noise. Each cog is carefully shaped for perfect chain alignment and quick, reliable shifting under all conditions. Whether sprinting or climbing, you’ll experience seamless transitions with minimal friction and noise.
• 【HGR Freehub Compatibility】 Fully compatible with 36.8mm HGR freehub bodies — the same as most 11-speed road hubs — this cassette allows you to upgrade to 12-speed performance without changing your hub or wheelset. Simple installation, no additional conversion parts needed, and perfect fitment make it ideal for easy upgrades.
• 【Precision CNC Machining & Reliable Performance】 Manufactured through high-precision CNC cutting, each cog guarantees perfect alignment, consistent spacing, and long-term durability. The result is professional-grade performance that delivers quiet operation, efficient power transfer, and dependable reliability across countless miles of road cycling.
• 【Advanced Material Composition】 Built with a smart mix of 7075-T6 aluminum and hardened steel, the SLR Gen3 ensures durability without compromise. The largest three cogs use aerospace-grade aluminum for lightness, while the remaining cogs are made from high-strength steel for maximum wear resistance — the perfect balance of power and endurance for competitive riders.