Wheels, tires, suspension alignment 911 Carrera (996) · Controlled matching: With a balancing machi- If a tire

Wheels, tires, suspension alignment 911 Carrera (996) Controlled matching: With a balancing machi- If a tire is damaged and it cannot be determined ne with matching program. In most cases, this with absolute certainty that there is no ply produces an even better result with regard to damage -with all of its consequences-or if the rolling smoothness (true running,imbalance the tire was thermally or mechanicallyover- and distribution of the balance weights)than can loaded due to a loss of pressure or other prior be achievedwith uncontrolled matching. damage,we recommend replacement of the tire in questionfor safety reasons. Maximumpermissible radial runout and lateral runout of the light alloy wheels = 0.7 mm When replacing a tire on an axle, make sure that Maximumpermissible radial runout and lateral the tread depth of the new tire does not differ runout of the wheel with tire = 1.25 mm from that of the other tire by mor~ than 30 %. Values less than 1.0 mm -better around 0.5 mm -are desirable. Repairs on "ZR'rtires are impermissible, as is the use of inner tubes in tubelesstires. After mountingthe tubeless tires, inflate them without valve insert to approximately3 bar gauge pressure in order to ensure that they The overview of summer and winter tires is are seated properly on the wheel. included in TechnicalInformation (TI),Group 4. At the latest when the pressure reaches Always observe the tire specification code when 3.0 bar, the tire beads must pop out of the replacing summer tires. The specification code deep bed and over the hump of the wheel NI, N2, N3 or NO distinguishessummer tires shoulder in order to avoid fractures of the bead expresslyapproved by Porsche from other core. If necessary, interrupt the process and versions of the same tire type and size. coat all necessary surfaces with lubricant(tire mounting paste) again. Then repeat the process. Screw in the valve insert and set the prescribed Tire agetire pressure (Page 44 -1). High-speedZR tires in particular should not be If new tires are to be mounted or the tires of too old -never older than 6 years. The age of the tire can be determ,inedvia theone axle are to be replaced, tires of the same manufacturer'scode, which is listed behindmake and with the same specification code the DOTcode on the tire sidewall. The date ofmust always be used on each of the two axles. manufacture(the last three digits)lis located at If tires are replaced on one axle only, the the end of the code.different tread depth than on the other axle can cause a noticeable change in the familiar handling. This is especially the case if new tires are mounted on the rear axle. This effect de- creases with increasing tire milage. 44 -18 44 General tire mounting instructions 9964417 Printed in Germany, 1997