Engineering Fundamentals: An Introduction to Engineering, 4th ed.c

3.11 Engineering Standards and Codes 67

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10

4091

•

Width of tire in millimeters

Passenger-car tire

Final digits of manufacturer’s

code tell when tire was made;

091 on this example means

9th week of ’01. Rubber

hardens with age; look

for a recent date.

How well the tire resists

heat. Best: A. Worst: C.

Ratio of sidewall height-to-tread width. Range: 35 to 80.

Higher numbers mean a smoother ride, but sloppier handling.

Lower numbers mean a harsher ride. but crisper handling.

Radial construction

Wheel diameter in inches

Maximum-load rating

index. Typical range:

75 to 100. Higher

means the tire can

carry more weight.

The amount of weight

is noted in small print

elsewhere on the

sidewall.

Code for the tire’s maximum

safe speed when properly

inflated and in good

condition. The code:

S – 112 mph

T – 118 mph

U – 124 mph

H – 130 mph

V – 149 mph

Z – 150-plus mph, as

specified by manufacturer

How well the tire stops

on wet roads in government

tests. Best: A. Worst: C.

Number of plies (layers) of

material making up the tire

How long the tread should last. Example:

Tread rated 220 should last twice as long

as tread rated 110. Index doesn’t equal

the specific number of miles of wear.

Standards and codes have been developed over the years to ensure that we have safe structures, safe

transportation systems, safe electrical systems, safe drinking water, and safe indoor/outdoor air quality. A

tire is a good example of an engineered product that adheres to such standards. There are many national and

international standardization organizations that set these authoritative standards. Standards and codes also

ensure uniformity in the size of parts and components made by various manufacturers around the world.

Source:Rubber Manufacturer’s Association

TABLE 3.5 Standard Shoe and Shirt Sizes in the United States and Europe

Men’s Shirts

Europe3637 3839 4142 43

U.S. 14 14 15 15 16 16 17

Men’s Shoes

Europe3839414243444546

U.S. 5 6 7 8 9101112

1

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