The Alpine JB utilizes an inverse tread that offers lower rolling resistance and is smoother compared to traditional knobby tires, while grip and confidence remain inherent features with increased durablity. Stronghold Casing. Item Specifications: Color: Black, Defined Color: Black, Intended Use: Road, ISO Diameter: 622 / road / 29", ISO Width (mm): 30mm, Labeled Size: 700 x 30, Tire Bead: Folding, Tire Diameter: 700c, Tire Type: Clincher, TPI: 120,