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New Jersey BMW CCA • View topic - What's the tyre truth?
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 Post subject: What's the tyre truth?
PostPosted: Sat Jan 04, 2014 5:43 pm 
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Joined: Thu Jan 02, 2014 7:48 pm
Posts: 7
Yeah I know that summer/extreme perf tyres don't work in the cold.
(I've got Bridgestone Potenza S-04 POLE POSITION 's on my M5.)
But....
Tire Rack says they'll crack and fail at below 42 degrees F
and Bridgestone says they'll crack and fail at 32 or below.
not that I intend to use them in the cold but I don't want to get caught out by a big drop in temp if I'm on the road.
any thoughts/experience with this?


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PostPosted: Sun Jan 05, 2014 7:21 am 
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Can't speak to your specific tires, but I can tell you that for the last 2 winters I have left the Yokohama S-Drives on our E30 325e. They exhibit no ill effects from operation in cold weather, albeit not for a lot of miles.


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PostPosted: Mon Jan 06, 2014 6:33 pm 
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PostPosted: Wed Jan 08, 2014 6:34 pm 
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PostPosted: Fri Jan 10, 2014 3:01 am 
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PostPosted: Fri Jan 10, 2014 5:35 pm 
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In my experience I've found that during nirmal driving on dry roads, tires will run 40 degrees above the ambient temperature so if it is 30 degrees out, the tires will run a 70 degrees. Imagine driving in your tires cold on a 60 degree day and that is about how much grip you will have. However in the cold, the rain will cool the tire and driving in the rain just above freezing can be a harrowing experience on some summer tires. In short, (most) summer tires are fine in the dry for the temperatures we experience here in NJ once they are warmed up with the notable exception of extreme performance summer tires that come with a warning against shattering at low temperatures (even during storage). Until the tires are warmed up, they are not grippy. Problem is, under steering into a corner on cold summer tires will warm up the fronts but leave the rears cold and leads to severe snap oversteer, so severe the stability control will not be able to compensate. If you keep your car in the garage, you won't have a problem with this but if you park outside, be sure to drive with caution until the tires are warmed up.

Where did you hear that these tires crack at low temperatures? Usually this only applies to r-compound tires (extreme performance summer and slicks).


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