944 Turbo - Wheels & Tires Maintenance - Tires/Wheels Summary
(1)
This tire may only be used on the front axle on Models 928, 928S, 928 S4, and 911 Turbo
(2)
Standard equipment from Model Year 1986 for 911 Turbo and 928S, 928 S4. Can be used on front and rear axle.
General Information
Always use new rubber valves when replacing tires. Rubber valve Part No. 900.265.001.50.
Before mounting tires check for directional markings (arrow) or inside/outside markings.
Always coat tire beads with rubber lubricant when mounting tire on rim.
Wipe off lubricant before inflating the tire to reduce the possibility of tire slippage on the rim. For the same reason the customer should be informed to
avoid fast acceleration or hard braking during the first 150 miles after tire mounting.
Inflate tubeless tire after mounting, but without valve insert, to approx. 4 bar pressure to guarantee correct fit of tire on rim. Tire beads must jump over
the hump of the rim shoulder no later than when reaching a pressure of 3.3 bar, in order to avoid rupturing the bead core.
Screw in valve insert and set the correct tire inflation pressure to specified value.
Forged 7", 8" and 9" Porsche rims must be fitted with specified valve supports to avoid excessive loads on the rubber valves as caused by the designed
location of the valve bore, Support Part Number:
911 361 561 00 or 911 361 561 01
Some 7" cast aluminum rims have a casting boss to support the valve stem and do not need a valve support.
On rims which have this cast boss, the wall thickness at the valve hole will be so large that when installing tubeless tire valves the 3 mm wide bead ring
must not be pulled through as is common for steel rims. Pulling the valve bead through would cause excessive expansion of the valve.
New tire instructions:
Always use tires of the same make and type.
When changing tires of only one axle set, new tires should be mounted on wheels of front axle (unless tires are different front and rear).
If replacing only one tire of an axle set, the difference in tread depth between tires must not exceed 30%.
Before removing a wheel, the wheel stud closest to the tire valve should be marked with paint to ensure correct reinstalling of the balanced wheel. The
lockable wheel nut must be installed on this stud. Refer to Bulletin Group 4, Number 8701, for balancing information.
Matching tires with forged rims
A machined depression on the rim well (of the perforated disc wheel rim) marks the point of highest radial run-out.
A red locating dot is pasted on the outside of the rim to mark the same point of highest radial run-out.
Tires are marked with a paint dot.
Align dots when installing tire on rim.
Dots must be within 30 mm (1-3/16 in.) of each other.
If the red locating dot is missing, mark the location of machined depression with chalk or tape before installing tire.
Balance Weights
Use only single balance weights of maximum 40 grams each on vehicles with brake pad wear indicators and 15" wheel rims. Sufficient clearance cannot
be guaranteed if larger weights are used.
