The Crankbrothers Synthesis Enduro - 27.5 Boost SRAM XD is a top-quality carbon wheel system designed specifically for enduro riding and racing. These wheels have been meticulously tuned and optimized to meet the demands and performance requirements of mountain biking.The front and rear wheels of the Synthesis Enduro have been individually tuned to address the specific loads and performance needed in each position. The front wheel has been tuned to improve handling, enhance grip, and provide better control when navigating turns. The wider inner rim width supports a wider tire profile, resulting in increased volume and better contact with the ground. This also helps to round the tire profile, adding to the overall turning performance.On the other hand, the rear wheel has been tuned to support peak loads and enhance stability when riding at high speeds. The narrower inner rim width supports a narrower tire profile, which improves rolling resistance and sharpens the tire edge for better grip.Here are some specifications of the Synthesis Enduro wheels:- Engagement: 17º (x6)- ETRTO (27.5): 585mm- ETRTO (29): 622mm- Hub: Synthesis Standard- Inner rim width front: 31.5mm- Inner rim width rear: 29.5mm- Outer rim width front: 37.5mm- Outer rim width rear: 36.5mm- Rim height: 18mm- Spoke count front: 28- Spoke count rear: 32- Spokes front: Sapim D-Light- Spokes rear: Sapim Race- Warranty: Lifetime (rim only)- Weight per set (27.5): 1845g- Weight per set (29): 1905gThe Crankbrothers Synthesis Enduro - 27.5 Boost SRAM XD is the ultimate choice for serious mountain bikers who want a robust and high-performance wheel system.