11-27-2021, 01:21 PM | #1 |
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Comparison of Tyre Grip on Dry, Wet and Icy Surfaces
I thought as it is the time of year to swap tyres for winter use that it would be good to understand the limitations of different tyre types. I took any of the full test results that Tire Rack has for different classes of Michelin tyres and rated the dry, wet and ice braking performance relative to the best in class of the tyres tested.
The braking performance was chosen as the best comparitor due to having less variables relative to test vehicle, driver, etc. Due to the variability of grip between different types of snow due to crystal structure and temperature, it wasn't included, but Tire Rack do the ice braking testing on an indoor ice rink, so the grip should be fairly consistent for the ice braking tests. |
11-27-2021, 01:53 PM | #2 |
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Nice to see that the A/S 4 compares favorably to both the A/S 3+ AND the PS4S.
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11-27-2021, 02:11 PM | #3 | |
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The best all round tyre that is the only one that can really be called "all season" if you do want grip in the winter is the performance winter Michelin PA4, being best for wet locations and OK for dry roads. The tread wear will be high, though, going by a couple of friends who have run the comparable Pirelli Sottozero 3 tyre year round (even at autocross). Really the gap between running a summer or UHP all-season tyre combined with a winter tyre for snow and ice conditions is vast compared with running an all-season or all weather tyre in snow and ice and keeping them on all year around. |
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11-27-2021, 02:21 PM | #4 | |
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My 2017 M240i: MHD, xHP, Modded OE Intake, AA GESi 400 CPSI Cat DP, Dinan Mid-pipe, M Performance LSD & Rear Diffuser, BMS Exhaust Tips, Apex EC-7 Wheels, M-Tech Front Lip, iND Painted Mirror Caps, Smoked Reflectors
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11-27-2021, 07:32 PM | #5 |
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I went with a set of A/S 4 tires on my rwd m235i last month. I don’t plan to drive the car much at all in the winter to avoid the salty NH roads. I wanted a tire that can handle cold fall & spring morning temps and a little rain if we get stuck in it. No complaints at all so far.
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11-27-2021, 11:24 PM | #6 |
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With the Michelin X-Ice Snow tyres taking 31.7 feet to stop on ice from 12 mph and the A/S3+ taking 61.0 feet from the same speed, that means the X-Ice can stop with an average g-force of 0.152 and the A/S3+ 0.079. This correlates to being able to descend an 8.6 degree icy slope with the X-Ice but only a 4.5 degree slope with the A/S3, before sliding out of control. This goes up slightly to 5.1 degrees with the A/S4.
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11-29-2021, 12:50 PM | #7 |
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I put X-Ice Snow on my e90 last winter and was the best winter tire I ever had on that car. I was able to drive decently on Georgetown lake in Denver at the annual event pretty well and really only got sideways on purpose. Glad to see the Pilot Alpin 4 compared to it as that seems like a better choice for Denver (depending on price) although going to a Cross Climate 2 seems like a good year round tire too.
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