Auto Tech Chapter 27

A plain steel wheel that is typically covered by a hubcap.

• Bar

• Casing plies

• Drop center

• EH2 rim

• Steel-disc-type rim

A condition in which the plane of the hub mounting surface is positioned toward the brake side or back of the wheel centerline.

• Negative offset

• Casing plies

• Drop center

• EH2 rim

• Steel-disc-type rim

A rubber or steel piece that attaches the tire valve to the rim.

• Valve stem

• Casing plies

• Drop center

• EH2 rim

• Steel-disc-type rim

A one-way valve used in a valve stem.

• Schrader valve

• Casing plies

• Drop center

• EH2 rim

• Steel-disc-type rim

A standardized grading system that indicates how well a tire will maintain contact with the road surface when wet.

• Traction grade

• Casing plies

• Drop center

• EH2 rim

• Steel-disc-type rim

A rating system that denotes the number of belt layers or plies that make up the tire carcass. In radial ties, ply rating denotes the relative strength of the plies, not the actual number of plies

• Traction grade

• Casing plies

• Drop center

• EH2 rim

• Ply rating

The part of the wheel containing the holes for the lug studs.

• Wheel center

• Casing plies

• Drop center

• EH2 rim

• Ply rating

The specialized rim design that is used with some run-flat tires.

• Wheel center

• Casing plies

• Drop center

• EH2 rim

• Ply rating

The number imprinted on the sidewall of a tire by the manufacturer as required by the National Highway Traffic Safety Administration that indicates the tire's tread life.

• Wheel center

• Casing plies

• Drop center

• Tread wear grade

• Ply rating

A condition in which both the front and the rear tires of a vehicle are experiencing the same slip angle.

• Wheel center

• Casing plies

• Drop center

• Neutral steer.

• Ply rating