Rene Herse Switchback Hill TC 650B x 48Inspired by the legendary Oregon Outback and named after the first climb of that epic 360 mile gravel ride race, the Switchback Hill remains the lightest, fastest and most comfortable ultra wide 650B tire. On the Oregon Outback route, the gravel is quite loose in places, and the extra flotation of the Switchback Hills gives you more speed and security when the going gets really rough. 30% of the Oregon Outback is on pavement, so we designed this tire