[quote author=jarry link=topic=134349.msg2894505#msg2894505 date=1233101284]
Just a note that defy's logic. page 8-35 of the '08 mazda3 owners manual says that Overinflating your tire creates a greater possibility of damage from road hazards.
If you want a stiffer tire for driving in snow, why does siping help you get better traction?
With higher pressure your sidewalls are stiffer which doesn't allow your tire to warm up as much while driving.
The tread section of your tire that is generally designed to help you turn are toward the outer part of the tire and having less weight on those because you have more crown on your tire will lessen your ability to take corners.
A stiffer tire is less able to conform to minor bumps, grooves and irregularities making it more likely to have an instant traction loss.
With a lower pressure you have more Tread distortion which helps keep your tires free of ice buildup and snow and your tires get warmer and stay a bit more pliable.
A wide track with wide grooves help you push more snow out of the contact areas. Floating comes from not having enough voids in your tire or having your voids iced up completely.
I gave you the answer... it's common knowledge among tire manufactures, automotive mechanics, racing teams, auto enthusiasts...and several car forums. I learned about it a number of years ago, from the Volvo forums...the Swedes know their stuff when it comes to winter driving conditions.
Overinflating is a bad thing, yes...but going with something like 38psi is not overinflation. Lastly, you should follow the recommended pressure range on the tire, not the car's owner manual. Especially when you no longer have the OE-equipped tires on the car.
Siping creates several small grooves, it can supposedly help in any condition but I feel it is somewhat of a gimmick. Why don't tires just come from the OE that way?
Tell you what, get some wide tires and keep pressure low...then let us know when you spin in the snow from taking a turn at a higher rate because you feel that tires work the same in slick conditions as they do in dry conditions.