Wheels And Tyres - Aston Martin DB9 2006 Manual

Wheels and Tyres

Tyres of the correct type, manufacturer and dimensions, with
correct cold inflation pressures are an integral part of every
vehicle's design. Regular maintenance of tyres contributes
not only to safety, but to the designed function of the vehicle.
Roadholding, steering and braking are especially vulnerable
to incorrectly pressurised, badly installed or worn tyres.
Tyres of the correct size and type, but of different make have
widely varying characteristics.
Only install tyres approved by Aston Martin (Refer to 'Tyres',
page 13.7).
Tyre Pressures
Ensure that correct tyre pressures are carefully maintained
(Refer to 'Tyres', page 13.7). Road holding, steering, braking
and tyre wear are especially vulnerable to incorrect tyre
pressures.
12.14
Check tyre pressures regularly and before starting any
journey. Re-inflate any tyre with a low pressure at the earliest
opportunity.
Pressures increase slightly when the tyres are hot. For an
accurate reading, pressures should be checked when the
tyres are cold. After adjusting the tyre pressures, ensure that
the valve caps are securely replaced to provide an additional
air seal and to prevent the ingress of dirt.
Tyre Service
Because of the high performance potential of this vehicle,
Aston Martin strongly recommend replacement of any
damaged or worn tyre.
The recommended tyres for this vehicle are asymmetrical
and must be installed to the wheel with the tyre mark
'Outside' on the outside of the wheel rim.
They are also of different sizes on the front and rear axles,
therefore complete wheels cannot be swapped from one side
of the vehicle to the other or between axles.
Damage
Tyres should be examined at regular intervals for wear and
damage. Inspect the tyre treads and sidewalls for damage, i.e.
bulges in the tread or the sidewalls, cracks in the tread groove
and separation in the tread or the sidewalls. If damage is
observed or suspected have the tyre inspected by a tyre
professional.
Stones or other objects which have become lodged in the
tyre treads should be carefully removed.
Flat Spots
It is a characteristic of high performance tyres that temporary
'flat spots' may develop if the vehicle is left standing in high
or low ambient temperatures for any length of time.