Crank Brothers Synthesis XCT i9 Alloy Wheel Precise handling at full speed. Crank Brothers' Synthesis XCT i9 Alloy wheels are built around a simple but effective idea: front and rear wheels have different jobs, so they should be built differently. The front wheel is tuned for compliance to maximize grip and control through corners, while the rear is tuned for stiffness to handle peak loads and maintain stability at speed. Each wheel's inner rim width is spec'd accordingly, rounding the tire profile up front for increased volume and contact patch, and sharpening it out back for improved rolling resistance and bite. A welded and sleeved 6013 T6 alloy rim, Sapim D-Light spokes, and an Industry Nine 1/1 hub with 4-degree engagement complete the package. Features Front and rear specific tuning - the front wheel is built for compliance and cornering grip, the rear for stiffness and stability under load Position-specific inner rim widths - wider up front to round the tire profile for increased volume and contact patch, narrower in the rear to sharpen the tire edge for grip and improved rolling resistance Industry Nine 1/1 Hub with 4-degree engagement for near-instant power transfer and reliable, low-maintenance performance Sapim D-Light spokes with front and rear specific spoke counts tuned to match each wheel's performance requirements6013 T6 alloy rim with a welded and sleeved joint for added strength and tubeless-ready compatibility SPECIFICATIONSCompatibility Tubeless ready / compatible Hub Industry Nine 1/1 Hub Hub Type6 Bolt Engagement4degDriver Options (Rear)HG (Shimano), XDR (SRAM)Rim Material6013 T6 Alloy Inner Rim Width26. 5mm (front), 24. 5mm (rear)Outer Rim Width31mm (front), 29. 2mm (rear)Rim Height21mm Spoke Count28 (front), 32 (rear)Spokes Sapim D-Light Weight831g (front), 998g (rear)Warranty2 years (rim only) | Crankbrothers | Synthesis Xct I9 Alloy 29" Wheel 29", Front, 15X110Mm, 6-Bolt | Aluminum