P2 Tires? Cracks?
03-20-2015, 02:41 PM
#22
Safety Car
37 degrees is an interesting number, Who came up with it?
Everything I have seen from Michelin is the grip goes away at 40*F, but they can be cautiously driven down to 20*F. And finally, under 20*F they should not be moved in any way.
Your dealer's suggestion is way more conservative...Who is right?
Everything I have seen from Michelin is the grip goes away at 40*F, but they can be cautiously driven down to 20*F. And finally, under 20*F they should not be moved in any way.
Your dealer's suggestion is way more conservative...Who is right?
I delayed leaving the Museum after delivery until the temp was above 20F, even though the car had been inside for several days. Since then, I have driven numerous times, including the entire trip home, in temps between 20 and 40F, with no cracks. Of course, the tires are MSSs, not Cup 2s.
03-20-2015, 02:49 PM
#23
37 degrees is an interesting number, Who came up with it?
Everything I have seen from Michelin is the grip goes away at 40*F, but they can be cautiously driven down to 20*F. And finally, under 20*F they should not be moved in any way.
Your dealer's suggestion is way more conservative...Who is right?
Everything I have seen from Michelin is the grip goes away at 40*F, but they can be cautiously driven down to 20*F. And finally, under 20*F they should not be moved in any way.
Your dealer's suggestion is way more conservative...Who is right?
03-20-2015, 09:30 PM
#24
They number 37 looks like a calculated number. I wonder if someone zigged instead of zagged when convert between *C and *F?
Regardless, other than this one thread, everything I have read from Michelin supports that the temps you drove in are acceptable in terms of avoiding cracks.
03-20-2015, 09:36 PM
#25
Instructor
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Not sure who at my dealership came up with the 37 degree number for releasing cars but they did say they have had them crack with temps in the 30s so maybe that plays into it. They have around 50 cars on site right now but I didn't ask how many of those are cracking. I just looked at a couple they showed me. I'm guessing the 37 degree number may be conservative but who knows.