Continental 700 x 21 700c Presta Tubes
About Continental - "Continental race tyres set global standards. They offer an outstanding riding experience by providing the best combination of grip, low rolling (speed), puncture protection and weight. They are made using some unique craftsmanship and technologies at our German production plant at Korbach and are serial winners in magazine product tests across the world."
Tubes for 700 x 21 tires