The Crankbrothers Synthesis Alloy Enduro 29 Boost Rear SRAM XD is a part of the crankbrothers tuned wheel system, which now includes an aluminium range. These wheels have been designed with a unique approach, focusing on a compliant front wheel and a stiff rear wheel to optimize ride characteristics for each. The compliant front wheel improves handling and control in turns, while the stiff rear wheel enhances stability and tracking at high speeds.In the alloy range, these differing characteristics are achieved through variations in spoke tension, spoke weight, spoke count, rim width, and rim weight. This range includes models for Enduro, XC/Trail, and E-bike, catering to a wide range of riders. For the Enduro and XCT models, there are two hub options available: a crankbrothers hub and an i9 1/1 hub, both offering 4 degrees of engagement. Additionally, the Enduro and XCT rims can be purchased separately for custom wheel building.The rear wheel of this particular model has an inner rim width of 29.5mm and a spoke count of 32. The spokes used are Sapim Race. This rear wheel weighs 1062g (27.5") or 1095g (29"). The hub engagement is 17 degrees.These Crankbrothers Synthesis Alloy wheels offer a high-quality and performance-driven option for riders seeking improved handling, stability, and control on their bikes.