Bfgoodrich Route Control T is a tyre made in total of 9 sizes, ranging from R17 to R17 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 435/50 R19.5 is 220mm wider than the narrowest dimension (215) and -50mm narrower than the widest one (385). This tyre profile of 50 means the sidewall height of the tyre is 50% of the tyre width (435mm), which results in 217.5mm sidewall height. In 435/50 R19.5, there is only one possible speed index for Bfgoodrich Route Control T - "K", which is good for speeds up to km/h.