Name: _____________________ Date: ________Period: ____
Ch. 74: Tire, Wheel &
Wheel Bearings pg#1483
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Objective: After studying this chapter, you will be able to:
Explain the parts, constructions, and operation of tires and wheel assemblies
Explain different types & sizes of tires and wheels
Correctly answer ASE Certification Test questions.
Tires
1. Automobile ___________ perform two basic functions: they act as a soft ____________
between the road & the metal wheel, and they provide adequate ___________ ( ___________ )
with the road surface.
2. Today’s automotive tires are filled with air, meaning they are ________________________.
3. Today’s vehicles use _____________________ tires, which do not have a separate inner tube.
4. The beads are two rings made of __________ __________ that are encased in rubber.
5. Body plies are rubberized ________ and ________ wrapped around the beads. They form the
__________________, or body, of the tire.
6. Tread is the _____________ _____________ of the tire that contacts the road.
7. The sidewall is the outer part of the tire that extends from the _________ to the ___________.
8. Belts may be used to strengthen the body plies and ___________ the ___________.
9. The liner is a thin layer of rubber that is bonded to the inside of the __________.
10. The rolling ______________ is a measurement of the amount of friction produced as the tire
operates on the road surface.
11. A high rolling resistance ______________ fuel consumption and wear. Typically, rolling
resistance is reduced by higher inflation pressure, proper tire design, & lower vehicle weight.
12. All American passenger cars manufactured since the early 1980s have been factory equipped
with _______________________ tires.
Name: _____________________ Date: ________Period: ____
For questions 13–15, match the following terms and identifying phrases.
(A) Bias ply tire (B) Radial ply tire
(C) Belted bias tire
13. ____ Plies and belts run at different angles; the belts lie under the tread area only
14. ____ Plies run at an angle from bead to bead; the angle is reversed from ply to ply
15. ____ Plies run straight across the beads, with stabilizer belts directly beneath the tread.
16. A radial tire has a very flexible sidewall and a stiff tread, giving it a very stable
___________________.
17. One possible disadvantage or a radial tire is that it may produce a harder, or ___________
ride at low speeds. The stiff tread area does not give or flex as much on rough roads.
18. Identify and label the three types of tire construction:
(A) ___________________ (B) ____________________ (C) ____________________
19. Tire _________________ on the sidewall of a tire give information about tire size, tire
__________, load-________________ ability, inflation pressure, number of plies, speed
rating, manufacturer, etc.
20. Tire size is given on the sidewall as a letter-number sequence. There are two common size
designations:
 Alpha-_____________________ (conventional measuring system)
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P-__________________ (metric measuring system)
***** We use P-METRIC 99.99% of the time*****
Name: _____________________ Date: ________Period: ____
21. The height-to-width ratio, known as the _____________________ ratio, is the most difficult
value to understand in the tire size designation.
22. Identify the points of measurement on a tire.
a) _____________________________
b) _____________________________
c) _____________________________
d) _____________________________
e) _____________________________
f) _____________________________
23. The maximum load rating of a tire indicates the amount of weight the tire can carry at the
recommended _______________ _______________.
24. A maximum recommended inflation pressure of _________ psi is common for many tires.
25. The tire sidewall also includes information on the number of plies and ply rating. A greater
number of plies generally indicates a greater __________-_______________ ability.
26. DOT stands for _______________________ ______ _______________________.
27. Following the letters DOT is the DOT ______________ _______________, which identifies
the particular tire manufacturer, plant location, construction and date of manufacture.
28. The DOT serial number is stamped into the tire ____________________.
Tire Grades (Tread wear, traction and temperature grades)
29. The higher the tread wear number, the ___________ resistant the tire is to wear.
30. Which tire rating provides the least traction? _______________________________
31. Tire temperature resistance is also given as an A, B, or C rating. Which rating resists a
temperature buildup best? __________
Speed Ratings
32. A tire __________ ____________ is the maximum allowable sustained road speed a tire can
safely withstand without failure. Speed ratings range from B (31mph) to Z (149mph).
Name: _____________________ Date: ________Period: ____
Special Tires and Tire Features
33. Asymmetric tires have a different tread patter on the inner edge than the __________ edge.
34. The ______________ tread pattern on asymmetric tires is designed to improve cornering on
dry surfaces, while the ____________ tread pattern improves traction on wet surfaces.
35. This type of tire is generally marked with the word __________________ to indicate which
way it should be mounted on the wheel.
Directional Tires
36. __________________ tires are high-performance tires designed to rotate in a specific
direction to minimize hydroplaning.
37. Hydroplaning is the loss of control that occurs when a layer of water prevents the tire
tread from contacting the __________ _______________.
38. A spare tire, or spare, is an extra wheel and tire assembly that
can be installed if the vehicle has a ____________ tire.
39. A full-size spare is a tire of the same ____________ and type used on the other four wheels.
40. Most new cars use a _________________ spare tire, or space saver spare, which is much
smaller than the normal tire used on the vehicle. It saves space in the trunk area.
41. A high-pressure spare is a compact spare tire that holds ___________-_______-___________
air pressure (typically about ___________ psi).
42. Most modern spare tires are designed for _______________________ use only.
43. Some tires are self-_____________________. These tires have a coating of sealing compound
applied to their liners. If a nail punctures a self-sealing tire, air pressure will push the soft
compound into the hole to stop _________ _________________.
44. __________ are used tires that have had a new tread vulcanized to the old carcass, or body.
45. Tires that have an extremely stiff sidewall construction so they are still
usable with a loss of air pressure are _____________________ tires.
Name: _____________________ Date: ________Period: ____
46. Wear bars are used to indicate a critical amount of ______________ _______________.
47. Many late-model vehicles are equipped with tire pressure ____________________ systems,
which alert the driver if one of more of the vehicle’s tires is underinflated.
Wheels
48. _____ Varieties of wheels may be made with all of
the following materials except:
(A) cast aluminum
(C) magnesium
(B) silver
(D) steel
49. Mag wheels, or mags, is a nick-name for _________________ or _________________ wheels.
These do not need ____________ covers. What is a nickname for wheel covers? ______________
50. A standard wheel consists of the __________ (outer lip that contacts tire bead) and the
__________ (center section that bolts to vehicle hub). Normally the spider is welded to the rim.
51. Name the components of the driving hub and wheel bearing assembly.
(A)____________________________
(B) ____________________________
(C) ____________________________
(D)____________________________
(E) ____________________________
(F) ____________________________
52. A ____ rim has small ridges that hold the tire beads in place.
(A) safety
(C) two-piece
(B) ridge
(D) mag wheel
53. A safety rim has small ridges that hold the tire beads on the wheel during a tire blowout
(instant _____________ and air loss) or a flat (slow _____________ reduces inflation pressure).
Name: _____________________ Date: ________Period: ____
Valve Stems and Cores
54. A valve stem is pressed into a hole in the wheel of a tire to allow inflation & ____________.
55. The valve _____________ is a spring-loaded air valve that is threaded into the valve stem.
56. The valve core allows air to be added to the tire when an __________ _______________ (tool
for filling tires with air) is placed over the valve stem.
57. A valve stem ___________ screws over the threaded valve stem to protect the air valve and
stem threads from dirt, moisture and _____________________.
Lug Nuts & Wheel Studs
58. Lug nuts hold the wheel and tire on the __________________. They fasten to special studs.
59. ___________ _______________ are the special studs that accept the lug nuts. The studs are
passed through the back of the hub or axle flange.
Wheel Weights
60. Wheel ________________ are small lead weights that are attached to the wheel rim to
________________ the wheel-and-tire assembly, preventing vibration.
Hub and Wheel Bearing Assemblies
61. Wheel ___________________ allow the wheel to turn freely around the spindle, in the
steering knuckle, or in the bearing support.
62. Most _____________ __________________ are either tapered roller bearings or ball bearings.
List the 3 basic parts of a wheel bearing:
63. _________________________________
64. _________________________________
65. _________________________________