Metzeler ME 880 Marathon is a winter tyre made in total of 30 sizes, ranging from R15 to R15 - this particular dimension is R16, which means it fits to a 16 inch/406.4mm diameter wheel. 240/50 R16 is 100mm wider than the narrowest dimension (140) and -120mm narrower than the widest one (120). This tyre profile of 50 means the sidewall height of the tyre is 50% of the tyre width (240mm), which results in 120mm sidewall height. In 240/50 R16, there is only one possible speed index for Metzeler ME 880 Marathon - "V", which is good for speeds up to 240 km/h.