Basic Tire Construction
Today's tires are filled with air meaning they are____.
Pneumatic
What is the design variation of a bias ply tire?
the plies run at an angle from bead to bead.
Where can tire markings be found?
On the sidewall of the tire.
What is a valve stem?
What are the three parts of a wheel bearing?
Outer race
balls or rollers
inner race
What are the 6 basic parts of a tire?
Beads, Body plies, Tread, Sidewall, Belts, Liner
The tire with belts added to increase tread stiffness.
What are tread wear bars?
They are used to indicate a critical amount of tread wear.
What is the purpose of Wheel Weights?
The small led weights that are attached to the wheel rim to balance the wheel-and-tire assembly, preventing vibration. The weights are used to offset a heavy area of the wheel and tire.
What is the purpose of the wheel bearing?
Allow the wheel to turn freely around the spindle, in the steering knuckle, or in the bearing support.
Name the three construction
Bias ply tire
Belted Bias Tire
Radial Ply Tire
Describe the design variation of a Radial ply tire.
Has plies running straight across from head to bead with stabilizer belts directly beneath the tread.
Explain tire speed ratings?
The maximum allowable sustained road speed a tire can safely withstand without failure.
Varieties of wheels may be made with all of the following materials EXCEPT what?
(a) Cast Aluminum (b) Silver
(c) Magnesium (d) Steel
(b) Silver
What are the basic parts of a hub and tapered roller bearing assembly?
Spindle Spindle adjusting nut
Wheel bearings Nut lock
Hub Cotter pin
Grease Seal Dust Cap
Safety Washer
Today's vehicles use (tubeless tires/inner tubes)____.
Which do not have a separate inner tube.
True or False: Rolling resistance is increased by higher inflation pressure, proper tire design, and lower vehicle weight.
False
It is typically reduced by higher inflation pressure.
What is the significance of DOT on the tire sidewall?
DOT stands for Department of Transportation.
When you see DOT on the tire sidewall, the tire has passed the prescribed safety tests.
A standard wheel consists of the _____ and the ______.
What are the pares of a hub and ball or straight roller bearing assemblies?
Outer Drive axle Ball Bearings
Steering Knuckle Driving Hub
Axle Washer Hub or Axle nut
Grease Seal
What two functions do tires perform?
They act as a soft cushion between the road and the metal wheel.
They provide adequate traction (friction) with the road surface.
Name a possible disadvantage of a radial tire?
May provide a harder or harsher ride at low speeds. The stiff tread area does not give or flex as much on rough roads.
What does GR78-15 mean on a tire sidewall?
G: Indicates load size and relationships. The higher the letter the larger the size and relationship.
R: Tire is a radial tire
78: the aspect or height-to-width ratio
15:Rim diameter in inches
Why is a drop-center commonly used?
It allows for easier installation and removal of the tire. Since the center of the wheel is smaller in diameter (dropped) than the rim, the tire bead can fall into the recess. Then, the other side of the tire bead can be forced over the rum for removal.
Look at picture of wheel and tire assembly. Label letters A-F.
(a) Well
(b)Wheel hub
(c) Wheel
(d) Tread or tire
(e)Lug Stud
(f)Lug Nut