Details: The Synthesis Enduro 11 - I9 Hydra 29 Boost SRAM XD is the first tuned carbon wheel system designed specifically for enduro riding and racing. These mountain bike wheels have been optimized to meet the unique performance requirements and loads of off-road biking.The front and rear specific wheels have been finely tuned to maximize performance. The front wheel is compliant tuned, improving handling and enhancing grip and control in turns. It also has a wider inner rim to support a wider tire profile, increasing volume and contact patch for improved turning.The rear wheel, on the other hand, is stiff tuned to support peak loads and enhance stability and tracking at high speeds. It has a narrower inner rim to support a narrower tire profile, which improves rolling resistance and provides better grip.Key Specifications:- Engagement: 0.52º quiet engagement / six pawls- ETRTO: 585mm (27.5), 622mm (29)- Hub: Industry Nine Hydra- Inner Rim Width: Front 31.5mm, Rear 29.5mm- Outer Rim Width: Front 37.5mm, Rear 36.5mm- Rim Height: 18mm- Spoke Count: Front 28, Rear 32- Spoke Type: Sapim CX-Ray (front), CX-Sprint (Rear)- Warranty: Lifetime (rim only)- Weight: 1760g per set (27.5), 1825g per set (29)Experience the performance and durability of the Synthesis Enduro 11 - I9 Hydra 29 Boost SRAM XD from Crankbrothers. These wheels are designed to exceed your expectations on the trails.