What is the main purpose of tires?
They hold air to support vehicle weight.
List 5 categories of powersports tire.
- Adventure
- Dual sport
- Sport bike
- Cruiser
- ATV
What is the tire carcass?
The body of the tire.
What are plies?
Layers of synthetic cord threads that strengthen the tire carcass.
What are the 2 tire ply arrangements?
Bias-ply and radial.
How are plies laid on a bias-ply tire?
They are laid at an angle (bias) to the bead edge.
What is a disadvantage to non-belted bias-ply tire construction?
This style is prone to sidewall flexing, which causes increased heating and higher risk of failure.
How does a belted bias-ply tire differ from a non-belted one?
Extra belted cords are added under the tread area, reducing flexing.
How are plies laid on a radial tire?
Perpendicular to the bead without crossing over each other.
Which tire ply arrangement has a lower sidewall profile?
Radial.
What standardized information might be found on a tire’s sidewall? (7 possible answers).
- Tire size.
- DOT number.
- Maximum inflation specs.
- Load index rating.
- Speed rating.
- Wheel rotation arrow.
- Tubeless type indication.
List 4 measuring standards for tire sizing.
- Metric
- Alpha numeric
- Inch sizing
- ATV tire sizing
In metric tire sizing, is the rim diameter measured in mm or inches?
Inches.
What does the load index rating indicate?
How much weight the tire is designed to carry at a specified pressure.
What is the speed rating?
A letter code that specifies the speed at which the manufacture expects the tire to sustain over a long period of time without coming apart.
What is the tire aspect ratio?
The height of the tire from bead to crest, calculated as a percentage of section width.
When setting tire pressure on a vehicle, should you follow the specs listed on the tire or on the vehicle?
Vehicle.
Is tire pressure set cold or hot?
Cold.
What are the two tire pressure monitor systems (TPMS)?
- Direct: Using pressure sensors and wireless signal.
- Indirect: Using speed sensors.
How is a TPMS valve style sensor activated?
By centrifugal force.
Where is a TPMS drop centre style sensor placed on a tire?
Opposite the valve stem for balance.
Is the contact area of a motorcycle tire curved or straight?
Curved.
What should be replaced every time a tubeless tire is replaced?
Tire valve.
Where is the Schrader valve found?
Inside the valve stem.
