Goodyear Kmax D is a allround tyre made in total of 19 sizes, ranging from R17 to R17 - this particular dimension is R22, which means it fits to a 22 inch/558.8mm diameter wheel. 305/70 R22 is 100mm wider than the narrowest dimension (205) and 10mm narrower than the widest one (315). This tyre profile of 70 means the sidewall height of the tyre is 70% of the tyre width (305mm), which results in 213.5mm sidewall height. In 305/70 R22, there is only one possible speed index for Goodyear Kmax D - "M", which is good for speeds up to km/h.