2008 Michelin Speedium2 Twin Pack, 2x700x23 TR8637 2008 Michelin Speedium2 Twin Pack, 2x700x23 TR8637 Start off the season with new tires ! Wide profile and lightweight flexible beads ISO Diameter: 622 ISO Width: 23 mm PSI: 90- 116 PSI 33 tpi casing Kevlar bead sport tire