Tubeless ready front and rear specific wheels are optimized to address the specific performance requirements and loads of mountain biking. New rim profile improves pinch flat protection. Shot peened anodized finish. CB Ratchet hub has 10 degree engagement and standard flanges to accommodate j-bend spokes. Comes with 36 tooth ratchet, can be upgraded to 54 tooth (CE0993). Compliant-tuned front wheel improves handling and maximizes grip. Wider rim width supports a wider tire profile up front for more air volume and larger contact patch (30mm inner width). Stiff-tuned rear wheel supports peak loads and enhances stability at speed. Narrower rim width supports a narrower rear tire for lower rolling resistance and good grip from edge knobs (28.5mm inner width). Front wheel built with Pillar SR TB 2016 spokes. Rear wheel built with Pillar SR TB 2018 spokes. 6-bolt disc. Lifetime warranty on Synthesis Alloy 2.0 rims