The crankbrothers tuned wheel system now includes an aluminium range. Crankbrothers synthesis wheels take a new approach to wheel systems by focusing on a compliant front wheel and a stiff rear wheel to achieve optimal ride characteristics. 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 different characteristics are achieved by variations in spoke tension, weight, count, rim width, and rim weight. The range includes Enduro, XC/Trail, and E-bike models, aiming to accommodate 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, providing 4 degrees of engagement. Additionally, the Enduro and XCT rims can be purchased separately, offering the option for custom wheel building.The rear wheel features an inner rim width of 31.5mm for 27.5/29 tires and 35.5mm for 27.5+ tires. It has a spoke count of 32 and uses Sapim E-Strong spokes. The weight of the wheel is 1238g for 29 tires, 1174g for 27.5 tires, and 1181g for 27.5+ tires. The hub engagement is 17 degrees.Overall, the Crankbrothers Synthesis Alloy E-MTB 27.5 Boost Rear SRAM XD is designed to provide an optimal riding experience with its unique wheel system.