about tire

1. TIRE AND WHEEL
Tire and wheel assemblies provide the only connection between the road and the vehicle.
WHEELS
Wheels are made of either stamped or pressed steel discs riveted or welded together. They
are also available in the form of aluminum or magnesium rims that are die-cast or forged
Magnesium wheels are commonly referred to as mag wheels, although they are usually made
of an aluminum alloy.
Aluminum wheels are lighter in weight when compared with the stamped steel type. This
weight savings is important because the wheels and tires on a vehicle are un sprung weight.
Sprung weight represents the weight of the vehicle that is supported by the
suspension. The suspension and wheels are unsprung weight. Lower amounts of
unsprung weight make the vehicle handle better, primarily on irregular surfaces.
It also gives a better ride. This is because when a tire hits a bump, the shock is
moved through the tire and wheel to the suspension. The shock that is not
absorbed by the suspension then moves to the rest of the vehicle. When the
unsprung weight is high, that weight and the shock from the road must be
absorbed by the suspension. This means more shock will be passed to the rest of
the vehicle.
How to Tell Tires Are Out of Balance
The main signs of an imbalanced tire or tires are:
 Vibration
 Uneven wear
 Increased fuel usage
 Suspension issues
 Tire/wheel runout
 Vehicle sensors (ABS, brake control module).
TIRES
The primarypurpose of tiresis to provide traction.Tiresalsohelpthe suspensionabsorbroadshocks,
but thisisa side benefit.
There are a numberof reasons
Why youshouldbe checkingthe balance of the tires/wheelsonyourcustomers’vehicles.The three
basictimeswhenbalancingshouldbe done include:
 Whena tire is replacedor repaired
 Whena balance weightis movedor fallsoff
 Whennewtires are purchase
Tire technicians know that balancing tire/wheel assemblies can eliminate vibration and
wobbling. This will improve tire wear, increase fuel mileage and remove stress from a
vehicle. Vibration caused by out-of-balance tires usually occurs at speeds of 50 mph to
70 mph. Consumers who only drive around town and not on expressways may never
notice their tires are unbalanced, but damage is still being done.