Porsche 911 Carrera Owner's Manual page 292

Tightening torque for both wheel bolts:
130 Nm (96 ftlb.).
290
Practical Tips, Emergency Service
911 Carrera 4, 911 Carrera 4S,
911 Targa 4, 911 Targa 4S
17 mm spacers
Danger!
Risk of accident. 17 mm spacers must only
be mounted on the rear axle together with
11.5 J x 19 (67 mm rim offset) wheels.
Always remove 17 mm spacers before
mounting other wheel sizes or an emergency
spare wheel because the wheel cannot be
mounted correctly.
For information on the spacers:
Please observe the chapter "SPACERS" on
page 286.
Removing the spacers
1. Unscrew the wheel bolts A with which the
spacer is fastened.
2. Remove the spacer.
3. Screw in 1 or 2 assembly aids instead of the
wheel bolts.
4. Fit wheel.
5. Insert wheel bolts A and tighten by hand.
Remove assembly aids, screw in remaining
wheel bolts. Initially tighten bolts slightly in
diagonally opposite sequence so that the
wheel is centred.
Please observe the chapter "WHEEL BOLTS"
on page 285.
6. Lower the car completely.
7. Tighten wheel bolts in diagonally opposite
sequence.
Immediately after changing a wheel,
use a torque wrench to check the pre-
scribed tightening torque of the wheel bolts
(130 Nm/96 ftlb.).