The Crankbrothers Synthesis Alloy Enduro 27.5 Boost Rear SRAM XD is a part of the crankbrothers tuned wheel system, which now includes an aluminium range. These 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 through variations in spoke tension, weight, count, rim width, and rim weight.The range includes models for Enduro, XC/Trail, and E-bikes to accommodate as many riders as possible. For Enduro and XCT models, you can choose between a crankbrothers hub and an i9 1/1 hub, both providing 4 degrees of engagement. Additionally, the Enduro and XCT rim only options allow for custom wheel building.The rear wheel specifications are as follows:- Inner rim width: 29.5- Spoke count: 32- Spokes: Sapim Race- Weight: 1062g (27.5) / 1095g (29)- Hub engagement: 17 degreesGet the Crankbrothers Synthesis Alloy Enduro 27.5 Boost Rear SRAM XD for excellent performance and ride quality.