There is an interesting aside to the quality of the tyre not related to braking but rolling resistance. Some cars come with very expensive low drag tyres that have a significant affect on CO2 output and possibly incur a lower tax bracket but if the expensive low drag covers are replaced by some Yingtong Ditch Finders that CO2 figure is irrelevant and could be well into the next bracket but unfairly (and unknowingly) the car still incurs the lower tax. A number of times I have fitted Uniroyal Rainsport XL rated tyres to a car which had some nasty Chinky rubbish on it and you can actually feel the significant difference when coasting. Another one that surprised me was I had the original Rain Sports on my Octavia and after a while the front sidewalls looked very compressed and they were noisy. The next tyres were the RS2 but I fitted the XL versions and I could not believe the difference in rolling resistance and the sidewalls stay pert longer although the noise was terrible when they were not even half worn.