Continental 0115850 Spike Claw 2.1 26 x 2.1 MTB Tire with 120 Studs is the tire for winter or snow use. It has 120 steel studs in the tread bars to provide grip on ice and snow. Thanks to its open tread, it has good self-cleaning properties and gets where it is going in mud and snow. The Spike Claw barely sinks into the surface by virtue of its large volume. Specs: Weight - 840 grams; Recommended PSI - 50; Maximum PSI - 65; PU - 5.