Designed for mountain, but certainly light (183g) and robust enough for gravel, road, and cyclocross. Larger flange on the brake side means shorter spokes on that side, which means tremendous lateral stiffness for cornering, as well as strong, predictable braking. 32 hole hub. Super low miles, cartridge bearings are silky smooth and without play, hub is in beautiful shape. It was built into a wheel and the rim had a problem, so it was carefully unlaced and removed. Quick release skewer not included.