Wheels and Tires: Description and Operation
Wheels and TiresINTRODUCTION
A number of alloy wheels are available ranging from 18 in. to 20 in. diameter. The rim widths are 8.5 in. front and 9.5 in. rear. An alloy space saver wheel is a standard fitment, except for vehicles fitted with run-flat tires.
A Tire Pressure Monitoring System (TPMS) is also available as a standard or optional fitment dependant on market. The TPMS is a driver warning system if a tire pressure is outside predetermined thresholds.
A 'run-flat' tire option is available with the 19 in. wheel option. Vehicles fitted with these tires have the TPMS fitted as standard and are not supplied with a spare wheel, vehicle jack or wheel brace.
WHEELS
TIRES
Tires are available in a number of sizes and tread patterns dependent on vehicle specification. Tire sizes are as follows:
^ T135/80R18 (space saver wheel)
^ 245/45ZR18 Front /275/40ZR18 Rear
^ 245/40ZR19 Front /275/35ZR19 Rear
^ 255/35ZR20 Front /285/30ZR20 Rear.
WARNING: Tires should be inflated to the recommended pressures (shown on a label on the 'B' pillar) only when the tires are cold (ambient temperature). If the tires have been subjected to use or exposed to direct sunlight, move the vehicle into a shaded position and allow the tires to cool before checking/adjusting the pressures.
Tire Changing
On vehicles fitted the TPMS, care must be taken when removing and refitting tires to ensure that the tire pressure sensor is not damaged.
Vehicles fitted with TPMS can be visually identified by an external metal locknut and valve of the tire pressure sensor on the road wheels. Vehicles without TPMS will have rubber tire valve.
When removing the tire, the bead breaker must not be used within 90° of the tire valve in each direction on each side of the tire.
When using the tire removal machine, the fitting arm start position must be positioned as shown in the tire changing illustration for each side of the tire. The wheel can then be rotated through 180° in a counter-clockwise direction. This will relieve tension from the tire bead allowing the remaining 180° of the tire to be manually pulled from the rim.
When refitting the tire, position the fitting arm as shown. Rotate the tire and take care that the bead on the low tension side of the tire does not damage the sensor.
Run-Flat Tires
Run-flat tires can be handled, fitted and removed using the same principles as used for normal low profile and high performance tires, with two exceptions:
^ They are always fitted with tire pressure sensors
^ They have thicker bead cores and more rigid sidewalls which require special care when being mounted on the rims.
It is recommended that the tire fitting machine is fitted with plastic rollers for the upper and lower bead. This will ensure that the bead is removed gently, protecting the rims and the tire pressure sensors.
Adequate amounts of special fitting lubricant must be used to ensure that the sidewalls move with the minimum exertion and locate on the rim flange correctly.
Run-flat tires can be identified by the marking 'RSC' on the tire sidewall.
NOTE: Vehicles fitted with run-flat tires are not supplied with a spare wheel, vehicle jack or wheel brace.
TREAD Act - NAS Only
Vehicles supplied to the North American markets must comply with the legislation of the Transport Recall Enhancement, Accountability and Documentation (TREAD) act. Part of the requirement of the TREAD act is for the vehicle to display a label which defines the recommended tire inflation pressure, load limits and maximum load of passengers and luggage weight the vehicle can safely carry. This label will be specific to each individual vehicle and will be installed on the production line. The label is positioned on the driver's side '13' pillar on NAS vehicles and the inside rear face of the LH door on Canadian specification vehicles.
This label must not be removed from the vehicle. The label information will only define the specification of the vehicle as it came off the production line. It will not include dealer or owner fitted accessory wheels and tires of differing size from the original fitment.
If the label is damaged or removed for body repair, it must be replaced with a new label specific to that vehicle. A new label is requested from Jaguar parts and will be printed specifically for the supplied VIN of the vehicle.