40 is considered low profile by the industry.
id say 45 and below.
i have 40 series on my car and when im changing tires, they always say, oh, u got low profiles, you have to wait for so and so, hes the only one that does low profiles.
do you guys find your steering wheels vibrate a lot?
i know low profile tires give a rougher ride but i think part of my problem may be i need to re-balance the wheels (seems like i have to do this every time i put back on my summers)..
how do wheels go out of balance? (from winter storage?)
it also depends on how you store them for the winter. If they are sitting upright (like when mounted to the car) if they loose air they can get flat spots where they are touching the ground which could cause some minor vibration.
TIRE STORAGE
The useful life of a tire, whether mounted or dismounted, is directly affected by storage conditions. Tires should always be stored indoors in a dark, cool, dry room.
DO
1 Remove the tires from the vehicle.
2. Remove the air from the tires and store them on their side in a cool/dark/dry environment.
3. Place tires in a black plastic bag when stored during the "off-season".
4. Make sure the temperature range in the storage location is between 40-90 degrees Fahrenheit.
DON'T
1. Don't store tires in direct sunlight or near electric motors. (Electric motors emit small amounts of ozone.) Tires need to be protected from light, especially sunlight. Light causes ultraviolet damage by breaking down the rubber compounds. The storeroom should not contain electrical welding or any other equipment that could produce ozone.
2. Don't apply any chemical treatments to Hoosier tires. (It's not necessary and may actually damage the integrity of the tire by breaking down the rubber properties of the tire.) Tires must not be allowed to come in contact with oils, greases, solvents, or other petroleum products that cause rubber to soften or deteriorate.
3. Don't store tires in sub-freezing temperatures for any length of time. (The rubber can freeze and may crack as a result.) (Top)
+1 on 40 - is the mark on considering it a low profile
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