“Fast” and “fat bike” may seem mutually exclusive until you’ve ridden Beargrease. Its 27.5 x 3.8” wheel and tire combo offer better rollover than your standard fat bike, and Beargrease’s carbon fiber frameset is lightweight yet stiff for excellent power transfer. But being svelte doesn’t mean sacrificing utility—ample cargo-mounting points make this the best fat bike for light-and-speedy adventures. SRAM’s X01 Eagle 1 x 12 drivetrain provides fast and light shifting action with gear range for tackling any trail obstacle.