Tire Tech 101. What is a tire made of. What percent of a tire is rubber? What is a pneumatic tire? What is the difference between radial & bias ply tires ? Why are tires black?. Raw Rubber Steel Nylon Polyester Rayon. Carbon Black Synthetic Rubber Fiberglass Aramid Brass.
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The cord angle is also reversed from ply to ply.
Tread is bonded directly to the top ply.Bias Ply Tire
For a 205/75R15 tire it would look like this
205 X .75 x 2 ÷ 25.4 + 15= 27.106
Tire size X Aspect ratio X 2 ÷ 25.4 + Rim size
Percentage of tires height in relation to it’s width A 60 series tire height will be 60% of the width. The aspect ratio can be a 40,50, 60,65,70,75,78
These are some of the most common ones.
TREAD WEAR, assigned a number, 150 will give you 50% more wear then one ranked 100
TRACTION - A, B, C (A Highest rating)
TEMPERATURE - A, B, C,
Tires are tested under Laboratory conditions they are not worn out, are properly inflated, not over loaded, damaged or altered.
Just because they have a speed rating does not mean the car is safe to drive at those speeds
Rating Maximum Speed
Q 99 mph
S 112 mph
T 118 mph
U 124 mph
H 130 mph
V 149 mph
W 168 mph
Y 186 mph
Z Above 149 mph