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     Tire Dictionary

Select a topic from the list below to learn more.

• Air Pressure
• Alignment of Vehicle
• All Season Tires
• Anti-Lock Brake System (ABS)
• Anti-Slip Control (ASR)
• Aquaplaning (Hydroplaning)
• Asymmetrical Tread
• Balancing
• Bead
• Braking distance
• Camber
• Casing
• Chains
• ContiComfortKit (CCK)
• Date of Manufacture
• Direction of Rotation
• DOT Serial Number
• Electronic Stability Program (ESP)
• Emergency Mobility Systems
• Hydroplaning (Aquaplaning)
• Load Index, Ply Rating or Load Range
• Minimum Removal Tread Depth


• Mixing Tires
• Radial Tires
• Reinforced or XL (extra load) Tires
• Replacement
• Revolutions Per Mile (RPM)
• Rolling Resistance
• Rotation
• Self-Supporting Run-Flat Tires (SSR)
• Speed Symbol
• Temporary Spare Tires
• Tire Gauge
• Tire Size Designation
• Tire Storage
• Toe
• Tread
• Tread Depth
• Tread Wear Indicator (TWI)
• Uniform Tire Quality Grading (UTQG)
• Valve
• Valve Cap
• Winter Tires

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Winter Tires

Tires designed for use in winter conditions generally have tread patterns, structure and materials to give superior performance. These tires are marked with the “M+S” designation plus a mountain/snowflake symbol.

When you change to winter tires, be sure they are the same size and construction type as the other tires on the vehicle.

Winter tires should be used on all four wheel positions.

In areas where heavy snowfalls are frequent, many drivers carry chains for use in emergencies, or have their tire dealer apply studded snow tires. Most provinces have time limits on the use of studs. Before installing studded tires, check the regulations in your area. If studded tires are applied to the front axle, they also must be applied to the rear axle.

If you use chains, make sure they are the proper size and type for your tires, otherwise they may damage the tire sidewall and cause tire failure.