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		<title><![CDATA[Maestro & Montego Owners Club - Off Topic]]></title>
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			<title>Tyre wet grip and efficiency ratings.</title>
			<link>https://maestro.org.uk/forums/forum/general-forums/off-topic/342605-tyre-wet-grip-and-efficiency-ratings</link>
			<pubDate>Sun, 30 Aug 2026 23:25:59 GMT</pubDate>
			<description><![CDATA[Now that the drought is over and the motorways seem to be full of people that either haven't noticed, or don't know that water alters their stopping distances I thought I'd do a few tyre &amp; stopping distance related sums. Having witnessed a incredible displays of stupidity on the M6 a couple of...]]></description>
			<content:encoded><![CDATA[Now that the drought is over and the motorways seem to be full of people that either haven't noticed, or don't know that water alters their stopping distances I thought I'd do a few tyre &amp; stopping distance related sums. Having witnessed a incredible displays of stupidity on the M6 a couple of years ago I bought a set of tyres that were A rated for both wet grip and efficiency. I knew that A would be better than B, C, D, E or F, but not how much better. Having found the specs for the wet grip ratings I have worked out the approximate stopping distances from 70mph in feet, excluding thinking time for a new tyre: A is 106, B is 111, C is 126, E is 137, F is 150, I didn't bother with G, as I had worked out that I did the right thing when I got to C. Then I did it again for a tyre with 2mm of tread left, still legal, but time for a change really...increase in distance is generally agreed upon as 44-50%, I assumed 44%, this gives distances of: A 153, B 160, C181, E 197, F 216. Interesting that a crappy tyre on its last legs more than doubles the stopping distance over a new A rated one, also interesting that an A rated one on its last legs is not much worse than a new F rated one. The worrying thing about this is that these differences are much bigger than the maximum claimed reduction in stopping distance given by modern anti skid braking systems (0-30%, depending on several variables and which of the many theories you believe). This implies that my old car could outbrake a modern car if the modern car had F rated part worn tyres on... Add the fact that the average tailgater is undoubtedly a bit thick, probably hasn't done any sort of pre-journey checks &amp; may or may not react rapidly..... I'm beginning to wish I hadn't done these sums.... The rolling resistance sums I couldn't be bothered to do, working out the effect of an xKg per tonne drag on the fuel consumption of a car that contained 81 horses when it came out of the factory, but some of the 81 might be having a nap now doesn't sound like a ten minute sum fest, this web site implies that it it won't have done any harm though... <a href="https://dynamon.co.uk/resources/burning-rubber-the-surprising-cost-of-rolling-resistance/" target="_blank">https://dynamon.co.uk/resources/burn...ng-resistance/</a>]]></content:encoded>
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			<dc:creator>Doctordiesel77</dc:creator>
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