Continental Speed King CX 700 x 35c PureGrip Folding Gravel Bike Tyre - BlackContinental Speed King CX 700 x 35c PureGrip Folding Gravel Bike Tyre Black The best of both worlds. The Speed King CX can be used both as a pure speed option on dry CX race courses, or as a nimble urban warrior on the cross commuter bike thanks to the two casing options available. Choose the supple and lightweight 32mm option for racing or a more robust 35mm for the gravel bike that allows you a fast on road experience with the option of jumping