Details:The Crankbrothers Synthesis XCT 11 - I9 Hydra 29 Boost SRAM XD is the first carbon wheel system designed specifically for cross country and trail riding. These wheels have been carefully tuned and optimized to meet the demands of mountain biking.The front and rear wheels are tailored to address the unique requirements and loads of off-road riding. The front wheel has been tuned to improve handling, providing maximum grip and control in turns. It features a wider inner rim width, which supports a wider tire profile, increasing volume and contact patch. This helps to round the tire profile, enhancing turning capabilities.On the other hand, the rear wheel has been tuned for stiffness, providing support during peak loads and enhancing stability and tracking at high speeds. It has a narrower inner rim width, which supports a narrower tire profile. This improves rolling resistance and sharpens the tire edge for better grip.Specifications:- Engagement: 0.52° quiet engagement with six pawls- ETRTO: 585mm (27.5), 622mm (29)- Hub: Industry Nine Hydra- Inner Rim Width: Front 26.5mm, Rear 24.5mm- Outer Rim Width: Front 31.1mm, Rear 29.5mm- Rim Height: 19mm- Spoke Count: Front 28, Rear 32- Spoke Type: Sapim CX-Ray- Warranty: Lifetime (rim only)- Weight: 1490g per setPlease note that this description does not include any reference to 'Upgrade Bikes' and has been optimized for SEO purposes.