Replacing Tyres

For safety and good performance, you must take care when selecting replacement tyres. Read our tyre changing safety tips.

Disregarding any of these safety precautions and instructions may result in tyre failure or explosion and serious personal injury or death.

Tyre Selection – Which Tyres Do I Need?

Consult the tyre placard, normally located on a door frame, door edge, or glove box door, or owner’s manual for the original tyre size, speed rating and recommended operating inflation pressures.

When replacing tyres on a vehicle, it is recommended that all four tyres be replaced at the same time for continued optimal vehicle performance. However, for those cases where this is not feasible, the new tyres should always be placed on the rear axle of the vehicle. Generally, new tyres with deeper tread will provide better grip and evacuate water more effectively, which is important as a driver approaches aquaplane situations. Placing greater traction on the rear axle on wet surfaces is necessary to prevent a possible over-steer and possible loss of vehicle control,especially during sudden manoeuvres.

IMPORTANT: Always check the vehicle manufacturer’s recommendation before replacing a tyre with a different size and/or construction.

Tyre Service Life

Cooper recommends that all tyres, including full-size spares, that are 10 or more years from their date of manufacture, be replaced with new tyres and that no tyre over 6 years old should be put into service. Since the spare tyre is used so infrequently, car makers have switched to narrow, compact spares to save space and weight. A spare tyre is a lifesaver when regular tyres go pop, but leaving the temporary tyre on for longer than the manufacturer recommends invites a host of problems.

Tyre service life is not determined by chronological age. The useful life of a tyre is a function of service and storage conditions. For each individual tyre, this service life is determined by many elements such as temperature, storage conditions, and conditions of use (e.g., load, speed, inflation pressure, impacts and road hazard damage) to which a tyre is subjected throughout its life. Since service and storage conditions vary widely, accurately predicting the service life of any specific tyre based on calendar age is not possible.

Cooper Tyre is not aware of scientific or technical data that establishes or identifies a specific minimum or maximum service life for passenger and light truck tyres.

Under no circumstances should a “maximum” service life recommendation for a tyre be considered as an “expected” service life. Tyres must be removed from service for several reasons, including tread worn down to minimum depth, signs of damage (cuts, cracks, bulges, impact damage, vibration, etc.) or signs of abuse (under-inflation, overloading, improper repair, etc.).

In some cases a vehicle manufacturer may make a recommendation for tyre replacement earlier than 10 years for their products based upon their understanding of the specific vehicle characteristics and application. If so, the consumer should follow those vehicle manufacturer’s specific recommendations for their vehicle.

Speed Rating

Cooper Tyre recommends that the speed capability of the replacement tyres should always equal or exceed the original equipment tyres.

When replacing your tyres, consult the owner’s manual for the correct size.




180 km/h (112 mph)


190 km/h (118 mph)


200 km/h (124 mph)


210 km/h (130 mph)


240 km/h (149 mph)


270 km/h (168 mph)


300 km/h (186 mph)

Cooper’s speed symbol designations in this table are based upon indoor wheel test conducted inm accordance with the Procedure for Load/Speed Performance Tests of the Economic Commission for Europe (ECE-Reg 30)

* For tyres having a maximum speed capability above 240 km/h (149 mph), a “ZR: may appear in the size designation.


Tyre Designation

Maximum Speed

275/40R17 93W

270 km/h (168 mph)

275/40R17 93Y

300 km/h (186 mph)

275/40ZR17 93W

270 km/h (168 mph)

275/40ZR17 93Y

300 km/h (186 mph)

While a speed symbol is an indication of the speed capability of the tyre, we do not endorse the operation of any vehicle in an unsafe or unlawful manner. NB: Load Carrying capacity is reduced as speeds increase over 130mph. Seek advice from your tyre dealer or Cooper Tyres on maximum loads and speeds.

Winter Tyres

Always fit winter tyres to all wheel positions.

Tyre Mixing

Replacement tyres should always have the same construction.

Most passenger tyres today are radial tyres. For best performance, we recommend the same size and type of tyre be used on all four wheel positions unless the vehicle manufacturer specified different sizes, front and rear, as original equipment. Check the vehicle owner’s manual.

Approved Rims

Tyres are designed to work on specific size rims. Please ensure that the tyre is fitted to a suitable rim.

Vehicle Modifcations

After-market modifications to your vehicle can adversely affect vehicle handling and stability.

Vehicle modifications and suspension alterations and/or the use of tyres not recommended by the vehicle manufacturer can adversely affect vehicle handling and stability.

Certain vehicle manufacturer’s may advise against the application of replacement tyres other than that of the same size and type of the original equipment tyres. For this reason, always check with and follow the vehicle manufacturer’s replacement tyre recommendations.

Unsuitable fitment may also invalidate the manufacturing warranty offered by Cooper Tyre.

Tyre Fitting

Tyre fitting can be dangerous and should be done only by trained persons using proper tools and procedures.

Serious injury or death may result from explosion of tyre/rim assembly due to improper fitting.

Always get a tyre dealer to fit your tyres on rims.