Wheels And Tires - Aston Martin DB9 2009 Owner's Manual

Wheels and Tires

Tires of the correct type, manufacturer and dimensions, with
correct cold inflation pressures are an integral part of every
vehicle's design. Regular maintenance of tires contributes
not only to safety, but to the designed function of the
vehicle.
Road-holding, steering and braking are especially vulnerable
to incorrectly pressurized, badly installed or worn tires.
Tires of the correct size and type, but of different make have
widely varying characteristics.
Only install tires approved by Aston Martin (Refer to 'Tires',
page 12.7).
Tire Pressures
Ensure that correct tire pressures are carefully maintained
(Refer to 'Tires', page 12.7). Road holding, steering, braking
and tire wear are especially vulnerable to incorrect tire
pressures.
Check tire pressures regularly and before starting any
journey. Re-inflate any tire with a low pressure at the earliest
opportunity.
Pressures increase slightly when the tires are hot. For an
accurate reading, pressures should be checked when the
tires are cold. After adjusting the tire pressures, ensure that
the valve caps are securely replaced to provide an additional
air seal and to prevent the ingress of dirt.
Tire Service
Because of the high performance potential of this vehicle,
Aston Martin strongly recommend replacement of any
damaged or worn tire.
The recommended tires for this vehicle are asymmetrical
and must be installed to the wheel with the tire 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.
11.15