The sram rail 50 275in ust bike wheel is an incredibly light weight and highly durable wheel that doesn39t sacrifice stability to achieve maximum performance on more technical terrain complete with a highly reliable hub at the heart of the mtb wheel you can ride with confidence regardless of the weather and ground conditions weighing in at just 1750g the 650b wheel is perfect for anything from a casual trail to intense races where any mistake results in loss the stiff steel spokes are the