Tufo 700X21 C S3 Lite Tubular-Clincher Tire Provides the ride quality and rolling resistance of a tubular tire but mounts to a regular clincher rim. Activated silica tread compound for extra precise handling characteristics. Overlapping sidewall construction and puncture proof ply make this tire very flat resistant. Inflates to 8-15 bar (115-220 p.s.i.) 120 T.P.I. / 280g