Caterham Seven Service Manual download pdf (Page 34)

Wheels & Tyres

WARNING!

DEFECTIVE TYRES ARE DANGEROUS!

DO NOT drive your car if any tyre is excessively worn

or damaged, or is inflated to an incorrect pressure.

Incorrect tyres can affect the stability and handling

characteristics of your car – only fit replacement tyres

that are identical to the original specification.

Caring for your tyres

Always drive with consideration for the condition of the

tyres, and frequently inspect the tread and side walls

for any sign of distortion (bulges), cuts or wear.

The most common causes of tyre failure are:

 Bumping against kerbs

 Driving over deep pot holes

 Driving with under or over-inflated tyres.

Tyre pressures

Correctly inflated tyres will ensure that you enjoy the

best combination of tread life, ride comfort, fuel

economy and road holding.

Check the pressures at least every week (including the

spare wheel), preferably when the tyres are cold (be

aware that the car can be driven up to one mile (1.6

km), before the tyres start to warm up).

Air pressure naturally increases in warm tyres; if it is

necessary to check the tyres when they are warm

(after the car has been driven for a while, even in cold

weather), you should expect the pressures to have

increased by between 4 and 6 Psi. In this

circumstance, DO NOT let air out of the tyres in order

to match the recommended pressures.

The recommended pressures are shown in ‘Technical

Data’ section of this book.

Remember; incorrectly inflated tyres may wear rapidly

or unevenly, are more easily damaged, and can

seriously affect the car’s handling characteristics.

Tyre wear indicators

The tyres on your car have wear indicators moulded

into the tread pattern at several points around the

circumference. When the tread has worn down to 1.6

mm, the indicators will come to the surface of the tread

pattern, producing the effect of a continuous band of

rubber across the width of the tyre.

The indicators provide warning that there is insufficient

tread remaining to provide good traction, particularly on

wet roads.

NOTE: Due to the minimal weight of the Caterham it is

more prone to aquaplaning in wet conditions. It is for

this reason that we recommend tyres are changed at

2.5mm even though the legal minimum is 1.6mm.

If tyre wear is uneven (on one side of the tyre only), or

becomes abnormally excessive, the suspension

geometry should be checked.

Valve caps

Keep the valve caps screwed down firmly. They

prevent dirt from entering the valve.

Punctured tyres

Your car is fitted with tubeless tyres, which will

normally lose pressure very slowly if penetrated by a

sharp object, provided it remains in the tyre. If you are

aware of this occurring, reduce speed immediately and

drive with caution until the spare wheel or replacement

tyre can be fitted. Remember, punctured or damaged

tyres must be permanently repaired or replaced, AS

SOON AS POSSIBLE!

NOTE: All cars are supplied with tyre fix repair spray to

repair a small puncture on the tyre surface temporarily.

Please follow the instruction on the repair spray can.

Caterham Cars recommend to replace the tyre rather

than repair. A tyre repair may not withstand the

performance demands you place upon it

Replacement tyres

Wheel rims and tyres are matched to suit the handling

characteristics of the car. Changing the specification of

a wheel or a tyre, can adversely affect the car’s

handling and ultimately, your own safety in emergency

road situations.

To be safe, ONLY fit replacement tyres that are

identical to the original specification shown in

‘Technical Data’ section of this book.

Changing a Wheel and Tyre assembly

Tools required

 Jack & handle

 Wheel nut spanner

Before you start, ensure that the vehicle is on firm level

ground. Always apply the handbrake and put into 1st

gear.

Positioning the jack

Position the jack under the jacking point (see

illustration).

Turning the jack screw by hand, raise the jack until the

centre of the jack platform fits snugly up to the jacking

point. Do not raise the car.

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Caterham Seven Service Manual Page 34

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