BFGoodrich Mud Terrain T/A KM3 is a summer tyre made in total of 31 sizes, ranging from R14 to R14 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. 315/70 R17 is 288mm wider than the narrowest dimension (27) and -10mm narrower than the widest one (305). This tyre profile of 70 means the sidewall height of the tyre is 70% of the tyre width (315mm), which results in 220.5mm sidewall height. In 315/70 R17, there is only one possible speed index for BFGoodrich Mud Terrain T/A KM3 - "Q", which is good for speeds up to 160 km/h.