The Crankbrothers Synthesis Enduro 11 - I9 Hydra 29 Boost Shimano Micro Spline is the first tuned carbon wheel system designed specifically for enduro riding and racing. With front and rear wheels specifically tuned and optimized to address the demands of mountain biking, this wheel system is sure to enhance your performance on the trails.The front wheel is compliantly tuned to improve handling and maximize grip and control in turns. It features a wider inner rim width, which supports a wider tire profile, increased volume, and a rounded tire profile for enhanced turning. On the other hand, the rear wheel is stiffly tuned to support peak loads and enhance stability and tracking at high speeds. It has a narrower inner rim width, which supports a narrower tire profile, improves rolling resistance, and sharpens the tire edge for better grip.The Crankbrothers Synthesis Enduro 11 - I9 Hydra 29 Boost Shimano Micro Spline features an engagement of 0.52º for quiet engagement and six pawls. It has an ETRTO size of 585mm (27.5) and 622mm (29). The hub is an Industry Nine Hydra and the inner rim widths are 31.5mm (front) and 29.5mm (rear). The outer rim widths are 37.5mm (front) and 36.5mm (rear). The rim height is 18mm.This wheel system is built with a spoke count of 28 (front) and 32 (rear), using Sapim CX-Ray spokes for the front and CX-Sprint spokes for the rear. It comes with a lifetime warranty for the rim only. The weight of the set is 1760g (27.5) or 1825g (29).Upgrade your mountain bike with the Crankbrothers Synthesis Enduro 11 - I9 Hydra 29 Boost Shimano Micro Spline, and experience the difference in performance and control on the trails.