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Sidewall info.

BCKNBLK

NAXJA Forum User
Location
Arizona
Does anyone have, or know where to get a chart or something explaining the various types of info on a tires sidewall. Im looking for something that actually breaks down the numbers as far as the treadwear rating, sizes, and other related info. Thanks.
 
www.tirerack.com

P225/75R15

P=Passenger LT=Light Truck
225=225mm Cross Section Width (the tire width at its widest point, for radials that only slightly larger than width of the tread)
75=Aspect Ratio in %, 75% means the sidewall height is 75% of the Width/Cross section
R=Radial
15=Rim Diameter, 15in.

A,B,C (and there is even AA for super car tires) for traction and temperature are Government Ratings given from government tests. A is best, B is good, C is bad, AA is even better than best. Never get a tire with a C rating, most tires will have a "B" rating for Temperature, only seen Hi-Performance Sports car tires with an "A" rating for temperature. The temperature is how well the tire handles/produces heat while driving, poor temp ratings means fast driving could cause a blow out.

Treadwear Rating is a percentage set by the manufacturer based off the standard treadwear specified by the government. Treadwear of 220 means the tread should last 220% of the standard set by the government. Since the manufacturer sets this figure, and the manufacturer has an interest in making their tire look better than others, this figure can be unreliable. I've seen tires with a 400 tread wear rating wear out before tires from another manufacturer with a 180 tread wear rating.

Tire rack has tables of feedback from owners of tires, on different categories, so you can compare different tires your interested in, this is good data, especially the unreliable tread wear rating. I'm more likely to believe feedback on a scale of 1 to 10 from hundreds of owners of the tire, than the number the manufacturer puts on the sidewall.
 
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