Optimum machining to give the lightest weight without compromising stiffness

Hell you could even strap a you're favourite tallboy on there

flex-free interface

Upper material: 3D Matrix TPU

Cons: There are lighter wheels out there

Crank Brothers Synthesis Alloy 2.0 DH Boost I9 Black Rear Wheel - Rear - 29 Inch - 12x148mm Boost - Aluminium - 29.5mm - 6 Bolt - SRAM XD Envelope Shipping Optimum machining to give theThe Crankbrothers Synthesis DH Alloy 2. 0 wheels are purpose built for downhill racing and riding, offering a tuned system for ultimate performance on the most demanding trails. The compliant front wheel enhances grip and control through rocks, roots, and technical features, while the stiff rear wheel provides the stability and durability needed to handle high speed impacts and aggressive cornering. Reinforced rims, spokes, and a DH specific profile