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.
BrassActual components that go into a tire.
The cord angle is also reversed from ply to ply.
Tread is bonded directly to the top ply.Bias Ply Tire
If you switch tire size on a car you can mess up the speedometer to figure out how close you are do the math to figure out the diameter.
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
Separations speedometer to figure out how close you are do the math to figure out the diameter.
tread tearing, chunking
Breaks in sidewall/tread
Excessive radial runout
Excessive lateral runout
not level accross tread
cone shapedTire Defects
Dynamic balance speedometer to figure out how close you are do the math to figure out the diameter.