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Originally Posted by 330toSRT8
I noticed the Porsche Cayenne Turbo comes stock with 275/40R20 tires. All but one tire in that size on Tirerack.com says it's for sport trucks. What is the difference between those tires and passenger car tires? Can they handle just as well? The SRT8 isn't exactly light, but still quite a bit less than a Cayenne.
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I'm not a tire expert, though I've busted plenty while working in a garage. But this site has more than you'll ever want to know:
http://www.canadiandriver.com/articl...tiresafety.htm Executive summary - Light Truck tires are sturdier with stiffer sidewalls to increase load carrying capacity (that would probably mean they are heavier than passenger car tires, too which would increase unsprung weight
Passenger tires have softer sidewalls for a better ride and will also handle better. Bottom line, if you want to go fast and handle well, stick with the passenger car tires. If you want to haul more junk in your trunk, go for the LTs
