Make sure that the rim size is correct. There are some rims that will have a measurement smaller than 18mm or have a measurement somewhere between the tolerances stated above (example - between 12.5mm & 14mm
or 18mm & 20mm). Tyres do not come with a fitting tool. A standard screwdriver doubles up perfectly as a Fitting Tool!

DO NOT ATTEMPT TO MOUNT THE TYRE
IF THE SIZE IS NOT CORRECT!