BFGoodrich G-Grip is a summer tyre made in total of 114 sizes, ranging from R14 to R14 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. 225/55 R17 is 60mm wider than the narrowest dimension (165) and 30mm narrower than the widest one (255). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (225mm), which results in 123.75mm sidewall height. In 225/55 R17, there is only one possible speed index for BFGoodrich G-Grip - "W", which is good for speeds up to 270 km/h. In 225/55 R17, G-Grip usually competes against MS plus 77, which is a tyre from Uniroyal with a rating of 55%, compared to 0% of the BFGoodrich in question.