Wheels and Tires
What forces must a tire deliver to the surfaces on which it travels? - ANS-Adequate traction with
road surface
Today's tires are filled with air, meaning they are_____. - ANS-Pneumatic
Today's vehicles use (tubeless tires/inner tubes)______. - ANS-Tubeless
Beads - ANS-Two rings made of steel wire encased in rubber. Hold tire sidewalls snugly against
the wheel rim.
Bodyplies - ANS-Rubberized fabric and cords wrapped around beads. Form carcass, or body,
of tire.
Tread - ANS-Outer surface of the tire that contacts the road
Sidewell - ANS-Outer part of the tire that extends from the bead to the thread. Markings on
sidewall provide information about the tire
Belts - ANS-Strengthen body plies and stiffen tread. Lie between tread plies
Liner - ANS-Thin layer of rubber bonded to inside of plies. Provides leakproof membrane for
modern tubeless tire.
Name 3 construction and design variations in tires: - ANS--Different number of plies may be
used
-Plies may run at different angles
-Different materials may be used
Rolling Resistance - ANS-Measurement of friction produced as tire operates on road surface
Bias ply tire - ANS-Has plies running at an angle from bead to bead; the angle is reversed from
ply to ply
Radial ply tire - ANS-Has plies running straight across the beads, with stabilizer belts directly
beneath the tread
Belted bias tire - ANS-Has plies and belts running at different angles; the belts lie under the
tread area only
, What was a benefit of the stable footprint found on a radial tire? - ANS-Very flexible sidewall
and stiff tread fo very stable footprint
What do tire markings reveal? - ANS--Tire size
-Tire model
-Load-carrying ability
-Inflation pressure
-Number of plies
-Speed rating
-Manufacturer
Identify the 2 common size designations for tires: - ANS--Alpha-numeric
-P-metric
What does GR 78-15 mean on a tire sidewall? - ANS--Load/size relationship
-Radial design
-Height-to-width ratio (65, 70, 78)
-Rim or wheel diameter in inches (13, 14, 15)
The height-to-width ratio, known as the ________ ratio, is the most difficult value to understand
in the tire size designation. - ANS-Aspect
The amount of weight the tire can carry at the recommended inflation pressure is known as the
__________ ______ rating. - ANS-Maximum load
A maximum recommended inflation pressure of ____ psi is common for many tires. - ANS-32
What does a greater number of plies or higher ply rating generally indicate? - ANS-Greater
load-carrying ability
What is the significance of DOT on the tire sidewall? - ANS-Indicates tire passed prescribed
safety tests. identifies particular tire manufacturer, plant location, construction, and date of
manufacturer
The higher the tread wear number, the (more/less)______ resistant the tire is to wear. -
ANS-More
Which tire rating provides the least traction out of ratings A, B, and C (A being best and C being
worst)? - ANS-C
Tire Speed Ratings - ANS-Maximum allowable sustained road speed a tire can withstand
without failure. Range from B(31 MPH) to Z(149 MPH). Tire's speed rating of tire must be higher
than speed at which vehicle will be driven
What forces must a tire deliver to the surfaces on which it travels? - ANS-Adequate traction with
road surface
Today's tires are filled with air, meaning they are_____. - ANS-Pneumatic
Today's vehicles use (tubeless tires/inner tubes)______. - ANS-Tubeless
Beads - ANS-Two rings made of steel wire encased in rubber. Hold tire sidewalls snugly against
the wheel rim.
Bodyplies - ANS-Rubberized fabric and cords wrapped around beads. Form carcass, or body,
of tire.
Tread - ANS-Outer surface of the tire that contacts the road
Sidewell - ANS-Outer part of the tire that extends from the bead to the thread. Markings on
sidewall provide information about the tire
Belts - ANS-Strengthen body plies and stiffen tread. Lie between tread plies
Liner - ANS-Thin layer of rubber bonded to inside of plies. Provides leakproof membrane for
modern tubeless tire.
Name 3 construction and design variations in tires: - ANS--Different number of plies may be
used
-Plies may run at different angles
-Different materials may be used
Rolling Resistance - ANS-Measurement of friction produced as tire operates on road surface
Bias ply tire - ANS-Has plies running at an angle from bead to bead; the angle is reversed from
ply to ply
Radial ply tire - ANS-Has plies running straight across the beads, with stabilizer belts directly
beneath the tread
Belted bias tire - ANS-Has plies and belts running at different angles; the belts lie under the
tread area only
, What was a benefit of the stable footprint found on a radial tire? - ANS-Very flexible sidewall
and stiff tread fo very stable footprint
What do tire markings reveal? - ANS--Tire size
-Tire model
-Load-carrying ability
-Inflation pressure
-Number of plies
-Speed rating
-Manufacturer
Identify the 2 common size designations for tires: - ANS--Alpha-numeric
-P-metric
What does GR 78-15 mean on a tire sidewall? - ANS--Load/size relationship
-Radial design
-Height-to-width ratio (65, 70, 78)
-Rim or wheel diameter in inches (13, 14, 15)
The height-to-width ratio, known as the ________ ratio, is the most difficult value to understand
in the tire size designation. - ANS-Aspect
The amount of weight the tire can carry at the recommended inflation pressure is known as the
__________ ______ rating. - ANS-Maximum load
A maximum recommended inflation pressure of ____ psi is common for many tires. - ANS-32
What does a greater number of plies or higher ply rating generally indicate? - ANS-Greater
load-carrying ability
What is the significance of DOT on the tire sidewall? - ANS-Indicates tire passed prescribed
safety tests. identifies particular tire manufacturer, plant location, construction, and date of
manufacturer
The higher the tread wear number, the (more/less)______ resistant the tire is to wear. -
ANS-More
Which tire rating provides the least traction out of ratings A, B, and C (A being best and C being
worst)? - ANS-C
Tire Speed Ratings - ANS-Maximum allowable sustained road speed a tire can withstand
without failure. Range from B(31 MPH) to Z(149 MPH). Tire's speed rating of tire must be higher
than speed at which vehicle will be driven
