The Crank Brothers Synthesis XCT 29er Carbon Wheelset are MTB's first tuned carbon wheel system for cross country/trail riding and racing. Synthesis is a tuned and optimized front and rear specific carbon wheel system that addresses the specific performance requirements and loads of mountain bike riding. A compliant tuned front wheel to enhance control and handling characteristics through increased dampening while maintaining the wheels contact patch. The front wheel is balanced with a stiff tuned rear wheel. This offers directional stability, anchoring and responsiveness in handling at speed.  Crank Brothers Synthesis XCT 29er Carbon Wheelset Features Mountain bike's first tuned carbon wheel system for cross country/trail riding and racing. Front and rear specific wheels tuned and optimized to address the specific performance requirements and loads of mountain bike riding. Compliant tuned front wheel improves handling and maximizes grip and control in turns. Wider inner rim width supports wider tire profile in front, increased volume and contact patch, and rounds tire profile to enhance turning. Stiff tuned rear wheel supports peak loads and enhances stability and tracking at speed. Narrower inner rim width supports narrower tire profile in rear, improves rolling resistance, and sharpens tire edge for grip. Crank Brothers Synthesis XCT 29er Carbon Wheelset Specification Engagement 17º (x6) ETRTO (27.5) 585mm ETRTO (29) 622mm Hub Synthesis Standard Inner rim width front 26.5mm Inner rim width rear 24.5mm Outer rim width front 31.1mm Outer rim width rear 29.5mm Rim height 19mm Spoke count front 28 Spoke count rear 32 Spokes front Sapim D-Light Spokes rear Sapim D-Light Warranty lifetime (rim only) Weight per set 1554g