| Author |
Message |
DGS (Dgs)
Member
Username: Dgs
Post Number: 345
Registered: 5-2003
| | Posted on Saturday, September 27, 2003 - 9:20 pm: | |
I can drive the S03s 24 miles through a suburban commute, and they'll still be cold to the touch. The Advans are a little better on that score in summer, but the manufacturer warns against using them in winter.
I'm trying to pick a winter tire that doesn't need a couple of laps of Watkins Glen to come up to temp.
But street tires are listed as "performance", "car" or "snow", not as "hard" or "soft".
While exact compounds would probably be proprietary data for the tire companies, I'd think there would be at least some relative comparison data around somewhere.
But then, I passed a car yesterday that had half the air out of the left front tire, and the driver didn't seem to notice. Maybe the tire companies are taking a "plug-n-pray" approach. |
Mitch Alsup (Mitch_alsup)
Intermediate Member
Username: Mitch_alsup
Post Number: 1114
Registered: 4-2002
| | Posted on Saturday, September 27, 2003 - 9:14 pm: | |
And basically, what hubert is talking about, is lower pressure in the tire allows its rolling resistance to go up, and thereby raising the temperature of the tire. |
Hubert Otlik (Hugh)
Intermediate Member
Username: Hugh
Post Number: 1455
Registered: 1-2002
| | Posted on Saturday, September 27, 2003 - 8:52 pm: | |
usually in cooler conditions it's okay to drop tire pressures by 2-3 lbs, while in the wet, you usually drop 5-6lbs off the reccomended dry pressures. the fact that you notice a lack of grip in the cold is account for by the facts that mitch outlined; the only way to really know if you're working in the right amount of heat into your tire is to check the temps with a probe type pyrometer, but that's a little much for just street driving. |
Mitch Alsup (Mitch_alsup)
Intermediate Member
Username: Mitch_alsup
Post Number: 1109
Registered: 4-2002
| | Posted on Saturday, September 27, 2003 - 7:36 pm: | |
"I've noticed that my Bridgestone S03s go "off" below 40degF."
In street driving, it can take quite a few miles anywhere under 50 dF before the tread compound comes up to (street) operating temperature. Somethimes it is harder to lean on a car in cooler weather and this also prevents the tires from comming up to a temperature where the tire attains maximum grip.
At the race track (TWS) last Dec in 45 dF weather I could only get the tires up to 165 dF Rear and 134 dF fronts, way cold. In the summertime, they are nice and toasty around 195 dF, when they get over 215 or so they start to slide around.
I got 5,000 street miles and 16 track days on a set of Bridgestone S03s.
"So with all the specs attached to tires, are there any references to indicate a tire's intended operating temperature range?"
Tire tread temperatures want to be over 180 dF and under 210 dF, however, it takes more time and sometimes more effort to heat a tire into its operating range in colder weather; there is lots more cooling available in colder air. |
DGS (Dgs)
Member
Username: Dgs
Post Number: 342
Registered: 5-2003
| | Posted on Saturday, September 27, 2003 - 10:03 am: | |
We always hear about different tire compounds in F1.
I've noticed that my Bridgestone S03s go "off" below 40degF.
Winter tires supposedly wear out quickly when used in summer.
So with all the specs attached to tires, are there any references to indicate a tire's intended operating temperature range?
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