myke pocock
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| posted on 24/3/20 at 08:14 PM |
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Tyre speed ratings
Do tyres with different speed ratings have slightly different handling characteristics? I ask as my Ford Kuga has a V and a W on the front axle. I had
two new tyres fitted on the front when I bought the car by the garage then hit a bottle on a cattle grid. Ripped the side wall and had an identical
tyre fitted but the MOT today identified that the ratings are different.
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cliftyhanger
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| posted on 24/3/20 at 08:48 PM |
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I guess it might make a tiny difference, but no more than different brands.
Was it a fail or advisory?
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snapper
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| posted on 24/3/20 at 11:13 PM |
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It only matters on a tin top if it’s a performance car
For a standard tug the speed rating must be higher than the cars advertised top speed.
People have said “well the U.K. speed is 70. The speed rating is also a load rating relating to performance.
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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adithorp
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| posted on 25/3/20 at 10:22 AM |
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You're highly unlikely to notice a difference ( we see mismatched speed ratings all the time at work).
A V tyre is rated to 149mph and a W to 168mph; you'll be running at 50% of the capacity of the tyre. If love to know why manufacturers are
specifying an SUV with a tyre rated for "exotic sports cars" (according to some lists)
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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coyoteboy
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| posted on 25/3/20 at 02:53 PM |
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I'm going to counter the others here - the sidewalls and plies are often different and having bought a replacement set of exactly the same tyre
but a different speed rating, I can confirm they do feel fundamentally different. Whether you care or not - who knows, if it's 10% different, do
you notice a 10% change in shock performance on one side? I don't like asymmetric handling on top of all the other variables out there 
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myke pocock
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| posted on 26/3/20 at 10:39 AM |
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Interesting point, thanks. Some of the replies I have received on here and other sites make reference to the speed rating of the tyres. I am fully
aware they are different. However to achive the difference in speed rating and therefore capability of the tyre there must be a difference in the
construction of the tyre and that is what my question realy referes to. Surely that could make a difference to the way the tyre performs. I will
shortly be getting two new tyres and will fit them on the front and then compare how it handles.
[Edited on 26/3/20 by myke pocock]
[Edited on 26/3/20 by myke pocock]
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Mr Whippy
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| posted on 26/3/20 at 08:31 PM |
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You may not notice any difference as they could just use stronger fibers which is where the strength at high speed comes from.
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