Yokohama Geolandar I/T-S G073 is a winter tyre made in total of 7 sizes, ranging from R16 to R16 - this particular dimension is R19, which means it fits to a 19 inch/482.6mm diameter wheel. 275/45 R19 is 60mm wider than the narrowest dimension (215) and -10mm narrower than the widest one (265). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (275mm), which results in 123.75mm sidewall height. In 275/45 R19, there is only one possible speed index for Yokohama Geolandar I/T-S G073 - "Q", which is good for speeds up to 160 km/h.