Metzeler ME 888 Marathon Ultra is a summer tyre made in total of 85 sizes, ranging from R15 to R15 - this particular dimension is R15, which means it fits to a 15 inch/381mm diameter wheel. 160/80 R15 is 20mm wider than the narrowest dimension (140) and -30mm narrower than the widest one (130). This tyre profile of 80 means the sidewall height of the tyre is 80% of the tyre width (160mm), which results in 128mm sidewall height. In 160/80 R15, there is only one possible speed index for Metzeler ME 888 Marathon Ultra - "S", which is good for speeds up to 180 km/h.