California Bicycles Maxxis Hookworm 26&rdquo; x 2.5&rdquo; Inch Bicycle Tire &ndash; Gas Bike Motorized Bicycle Tire Upgrade The Maxxis Hookworm 26 x 2.5 Inch is made for abuse, made with a 70a black compound for maximum strength against the streets and its elements Grooves designed for straight-line performance and cornering control, not bare or standard grooved like inferior tires Capable of holding up to 110 PSI- lots of air for lots of performance