The Schwalbe Black Jack tire is a versatile tire with good grip and excellent rolling properties. This tire is ideal for off-road cycling, especially for children's and youth bikes. The tire's tread pattern provides good grip on various surfaces while also rolling smoothly on paved roads. The Black Jack tire is equipped with Schwalbe's K-Guard puncture protection, which significantly reduces the risk of punctures. With a 20x1.90 inch size and an ETRTO size of 47-406, this tire is a perfect fit for mountain bikes and ATB bikes. Product specifications - Size: ETRTO 47-406 (20 x 1.90 Inch) - Type: Wired - Rubber compound: SBC - Version: K-Guard - Color: Black - Seal: Tube - Weight: 450 g - Tire pressure: 2.00 - 4.50 Bar (30 - 65 psi) - Max. load: 65 kg - EPI: 50