Kenda Double BLK Tire - 27.5 x 2.40 Tubeless Folding BLK Trail Dual LayerKenda Double Black Tire 27. 5 x 2. 40 Tubeless Folding Black Trail Dual Layer. The Double Black is an all conditions gravity and trail tire. Its a true all rounder with noticeably faster rolling speed and a planted and confident feel on hardpack and loose over hard conditions. Choose from a range of casing and compound options to maximize your ride experience; the Double Black provides the grip you can trust for all around conditions. Medium height