Metzeler ME 888 Marathon Ultra is a summer tyre made in total of 85 sizes, ranging from R15 to R15 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. 210/50 R17 is 70mm wider than the narrowest dimension (140) and -80mm narrower than the widest one (130). This tyre profile of 50 means the sidewall height of the tyre is 50% of the tyre width (210mm), which results in 105mm sidewall height. In 210/50 R17, there is only one possible speed index for Metzeler ME 888 Marathon Ultra - "W", which is good for speeds up to 270 km/h.