For all-round soft-pack conditions, the Grifo is the open tubular (clincher) of choice. Whether a Pro or just a hard core rider Grifo is the tyre you need. This tyre offers unbelievable grip with no rolling resistance compromise. Challenge Grifo Pro HTU Tyre Features SETA ULTRA S Use: Cross Racing and All Around Soft Pack. Size: 700. Tyre Width: 33mm. Internal Rim Width: 15-19mm. Weight: 405g. Casing: Silk. Flat Protection: PPS. BAR: 1.6-6. PSI: 23-90. Inner tube: Latex.     TE S Use: Cross Racing and All Around Soft Pack. Size: 700. Tyre Width: 30 or 33mm. Internal Rim Width: 15-19mm. Weight: (30mm) 405g (33mm) 410g. TPI: 320. Casing: Corespun Cotton. Flat Protection: PPS. BAR: 1.6-6. PSI: 23-90. Inner tube: Latex.   PRO Use: Cross Racing and All Around Soft Pack. Size: 700. Tire Width: 33mm. Internal Rim Width: 15-19mm. Weight: 415g. TPI: 300. Casing: SuperPoly.Flat Protection: PPS. BAR: 1.6-6. PSI: 23-90. Inner tube: Latex.