Teravail Washburn Tire - 650b x 47 Tubeless Folding Black DurableTeravail Washburn Tire 650b x 47 Tubeless Folding Black Durable. Whether your route covers rough roads or fast gravel or even both in the same day the Teravail Washburn tire is built for the job. Its center slick provides awesome rolling efficiency on pavement and packed dirt while the shoulder lugs take over in the turns digging in for confidence in loose corners. Designed and inspired by experiences riding and racing rolling coarse gravel routes