Maxxis Ignitor TR Tire Max Ignitor 27.5x2.1Bk Fold/60 Sc/tr The well-spaced tread pattern fills in nicely to provide low rolling resistance in the straights, while the ramped pentagonal knobs provide excellent traction in the corners and in medium soil. SC - Single compound casing for a durable, dependable tire TR - Tubeless Ready - sealant required Weight Model Number TB90954000