Rene Herse Switchback Hill, 650B x 48 - StandardNamed after the first climb of the Oregon Outback route, a 360 mile gravel ride race over 70 30 gravel and pavement, the Switchback Hill Standard is designed to roll as fast and grip as well as a good racing tire. With enough tread in the center to last many miles combined with supple shoulders, the Switchback blends the best of both worlds, marrying gravel, grip and glide in one compelling tire package.