Laufenn G Fit 4S is a allround tyre made in total of 4 sizes, ranging from R13 to R13 - this particular dimension is R15, which means it fits to a 15 inch/381mm diameter wheel. 165/65 R15 is 10mm wider than the narrowest dimension (155) and 50mm narrower than the widest one (215). This tyre profile of 65 means the sidewall height of the tyre is 65% of the tyre width (165mm), which results in 107.25mm sidewall height. In 165/65 R15, there is only one possible speed index for Laufenn G Fit 4S - "T", which is good for speeds up to 190 km/h.