2009-2012 Boxster – Manual

2009-2012 Boxster – Manual

Page: 200

If one faulty tire is replaced it should be noted that the difference in tread depth on one axle must not exceed 30%.

Handling inconsistencies may result.

  • Perform a visual inspection if necessary.

Damaged Tire Check

Driving the vehicle with low tire pressure increases risk of a tire failure and resulting loss of control. Furthermore, low tire pressure increases rate of wear of the affected tires.

  • Check tires – including sidewalls – regularly for foreign bodies, nicks, cuts, cracks and bulges.
  • After driving off road, examine tires for signs of damage such as cuts, tears, bulges or foreign objects stuck in the tread. Replace a damaged tire if necessary.
  • Cross curb edges slowly and at right angles if possible.
    Avoid driving over steep or sharp curbs.
  • In cases of doubt, have the wheel (particularly the inner side) checked by an authorized Porsche dealer.

Tire replacements
If in doubt, contact your Porsche dealer. Use only tire makes and types approved by Porsche.

If you do not use a Porsche recommended replacement tire, make sure that you purchase your new tires from a reputable tire dealer and that the dealer complies with all manufacturers warnings for those tires.

Only tires with the same make and with the same specification code (e.g. "N0", "N1"...) can be mounted.

Before mounting new tires, check with your Porsche dealer about the current release status.

Use tires with "ZR" quality standards. There are currently no standards concerning tire strength at speeds above 150 mph (240 km/h).

Tires should be replaced no less than on one axle at the time.

Only tires of the same make and type must be used. Mixed tires are not permissible.

Initially, new tires do not have their full traction. You should therefore drive at moderate speeds during the first 60 - 120 miles (100 - 200 km).

If new tires are installed only on one axle, a noticeable change in handling occurs due to the different tread depth of the other tires.

This happens especially if only rear tires are replaced. However, this condition disappears as the new tires are broken in.

  • Please adjust your driving style accordingly.

Installation of new tires should only be done by a qualified tire technician.

Rubber valve stems must be replaced every time a tire is replaced.

For metal valves, the installation and replacement instructions must be observed.

  • Use only genuine Porsche metal valves.
  • Protect the valve inserts against soiling with valve caps.
    Soiled valve inserts can cause a gradual loss of air.
  • Use only plastic valve caps.

Parking at the curb

Curb Impact / Tire Damage

Hard impacts against curbs (or traffic islands) are dangerous and may cause hidden tire damage which is not noticeable until later. Such damage can result in accidents at high speeds.

Depending on the force of impact, the edge of the rim can also be damaged.

  • If you are in doubt, have the wheel checked by an expert, particularly if you suspect damage on the inside.
  • If you must drive over a curb or other obstacle, drive slowly and at an obtuse angle. Exercise care when parking along curbs.

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