none67 said:just curious, what happens AFTER you go pass the speed rateing on a tire? do they expand, or blow, or what?
This is not quite accurate. Not to pick on you, but check out this link to Car & Driver for a good explanation on tire speed rating. From the link:daveoxide said:...If tires aren't at their maximum rated psi, speed ratings and load ratings are both lower than stated (some more than others, depends on the tire)...
It's a good read.In the high-speed test, the basic methodology is unchanged. The tires are tested on a 67-inch-diameter drum in a chamber with the temperature controlled at 100 degrees. Since the round surface of the drum deforms the tire carcass more than a flat road would, a speed of 80 mph on a drum is the equivalent of from 85 to 90 mph on flat pavement.
The tires to be tested are inflated to 32 psi for standard P-metric tires (the “P” stands for passenger-car tire) and for tires without the P but with a letter speed rating (S, H, V, and others). Extra-load P-metric tires are tested at 38 psi. These conditions are unchanged from those of the old FMVSS 109 tests.
Red Barchetta said:This is not quite accurate. Not to pick on you, but check out this link to Car & Driver for a good explanation on tire speed rating. From the link: It's a good read.
none67 said:btw, dave, what tires do you use?
D.Hearne said:I wouldn't worry about exceding the speed rating, it's mostly there as a sales tool. Unless you're gonna somehow get to run your car at Daytona or Taladega, you'll never be able to run fast enough or long enough to blow the tire. The Highway patrol will get you long before the tires let go. Just as a reference, back in the late 80's I had my own 18 wheeler ( Peterbuilt what else LOL) and one night me and another driver "hooked up" heading west on I-10 from I-75 in Florida, It took us 3 hours to run from the I-75 junction, to Pensacola, a distance of about 290 miles. The only tire on my truck that didn't handle the run was a recap on the trailer, this one let loose just getting into P'Cola. None of these tires were "speed rated" Just ignore the speed rating.
daveoxide said:They are Yokohama AVS100's. They have superb grip in both wet and dry. They are a soft compound tire, so mileage isn't great, expect them to last 10,000 to 15,000 miles. They are an ultra high performance tire, and they are damn sticky! And because of my more extreme alignment and the fact that they have those big V-shaped treads, it tends to follow the grooves in the road, but it isn't a big deal.
none67 said:soudns nice, but i don't think i can afford the 10,000-15,000 miles though. she will get drivin way to much.
what do you guys suggest? (15s, or 17s)
daveoxide said:I take that back, mileage is probably closer to 15,000 to 20,000 miles out of the tires. I drive my Mustang hard too, so you could get more than that out of them I'm sure. With tires, it's a give and take between mileage and performance, and in my case, I chose performance..
I couldn't tell you. That's a question for a tire engineer. As with everything else, heat is a tires enemy. I would ASSuME that different ambient temperatures would have an affect on tire reliability. Unless you're driving in the same conditions as in the testing process, the maximum rating could vary. With that assumption, the cooler the tire, the less likely it will fall apart. That's why you raise the psi when you have a heavier load on the tire. This keeps the tire sidewall from deforming more than normal while keeping a full contact patch on the ground, reducing heat build up. Once again, I'm no tire engineer (or any kind of engineer for that matter), but I think heat is the limiting factor. With increased speeds and loads, comes increase heat. Ultimately, I believe that is your limiting factor.daveoxide said:I stand corrected. But if the tires aren't inflated to that 32 psi, then speed rating and load ratings wouldn't be at their maximum, right?
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