Bridgestone B250 is a summer tyre made in total of 16 sizes, ranging from R13 to R13 - this particular dimension is R14, which means it fits to a 14 inch/355.6mm diameter wheel. 165/70 R14 is 10mm wider than the narrowest dimension (155) and 30mm narrower than the widest one (195). This tyre profile of 70 means the sidewall height of the tyre is 70% of the tyre width (165mm), which results in 115.5mm sidewall height. In 165/70 R14, there are 2 possible speed indexes for Bridgestone B250 - "S","T", which are good for speeds up to 180, 190 km/h.