The Crankbrothers Synthesis XCT - 29 Boost Shimano is the first tuned carbon wheel system designed specifically for cross country/trail riding and racing. This mountain bike wheelset includes both front and rear wheels that have been carefully tuned and optimized to meet the demands and performance requirements of mountain biking.The front wheel of the Synthesis XCT features compliant tuning, which improves handling and provides maximum grip and control when navigating turns. The wider inner rim width supports a wider tire profile, increasing volume and contact patch for enhanced turning capabilities. On the other hand, the rear wheel has been stiffly tuned to support peak loads and enhance stability and tracking at high speeds. The narrower inner rim width allows for a narrower tire profile, improving rolling resistance and providing better grip with a sharpened tire edge.In terms of specifications, the Synthesis XCT has a 17-degree engagement and an ETRTO of 622mm. The hub used is the Synthesis Standard, and the front wheel has an inner rim width of 26.5mm, while the rear wheel has an inner rim width of 24.5mm. The outer rim width is 31.1mm for the front wheel and 29.5mm for the rear wheel. The rim height is 19mm.This wheelset features 28 spokes on the front wheel and 32 spokes on the rear wheel. The spokes used are Sapim D-Light. Furthermore, the Synthesis XCT comes with a lifetime warranty for the rim only, providing peace of mind to riders. With a weight of 1575g per set, the Crankbrothers Synthesis XCT - 29 Boost Shimano is a top-notch carbon wheel system that delivers exceptional performance for cross country and trail riding.