Details: The Synthesis Enduro 11 - I9 Hydra 27.5 Boost Shimano is the mountain bike's first tuned carbon wheel system specifically designed for enduro riding and racing. With front and rear specific wheels that are tuned and optimized to address the specific performance requirements and loads of mountain bike riding, these wheels are perfect for any enduro enthusiast.The front wheel is compliant tuned, improving handling and maximizing grip and control in turns. With a wider inner rim width, it supports a wider tire profile in the front, increasing volume and contact patch. This rounds the tire profile to enhance turning.On the other hand, the rear wheel is stiff tuned, supporting peak loads and enhancing stability and tracking at speed. With a narrower inner rim width, it supports a narrower tire profile in the rear. This improves rolling resistance and sharpens the tire edge for grip.Specifications include a quiet engagement of 0.52º with six pawls for efficient power transmission. The ETRTO sizes available are 585mm for the 27.5" wheel and 622mm for the 29" wheel. The hub is from Industry Nine Hydra, ensuring reliable performance. The inner rim width is 31.5mm for the front wheel and 29.5mm for the rear wheel. Meanwhile, the outer rim width is 37.5mm for the front wheel and 36.5mm for the rear wheel. The rim height is 18mm.The spoke count is 28 for the front wheel and 32 for the rear wheel. The spokes used are Sapim CX-Ray for the front wheel and CX-Sprint for the rear wheel.With a lifetime warranty (rim only), you can trust in the durability and reliability of these wheels. The weight of the set is 1760g for the 27.5" wheel and 1825g for the 29" wheel.Overall, the Synthesis Enduro 11 - I9 Hydra 27.5 Boost Shimano from Crankbrothers is a top-quality carbon wheel system that offers exceptional performance for enduro riding and racing.