Component Overview - Central Bolt System
- Hub cap
- Wheel bolt with cone ring (not available separately)
- Wheel
- Lockable wheel bolt/locking mechanism (not available separately)
- Wheel driver (only available in a set as spare part/5 ea. No. 5). Be aware of the difference between the 911 Turbo (991) and the 911 GT3 (991)!
- Brake disc (grey cast iron or PCCB)
- Wheel hub
The 911 Turbo (991) can be supplied with a central bolt as an optional extra.
A central bolt is provided as standard with the 911 GT3 (991). In terms of its design, the bolt is similar to that on the 911 Turbo (991). The colors of the wheels and the wheel bolts may be different. The design of the wheel drivers is also different.
The wheel bolt -2- is identical for all four wheels (right thread).
The lockable wheel bolt -4- is an assembly (only available as a whole) whose splines engage in the wheel hub -7- on one side and in the wheel bolt -2- on the other (if activated).
The lockable wheel bolt -4- can be pulled out of the wheel hub -7- once the wheel bolt -2- has been removed. For safety reasons , only remove the lockable wheel bolt -4- in order to check it and then re-insert it immediately in the wheel hub -7- .
Before fitting the wheel, check that the lockable wheel bolt -4- is functioning properly. Under no circumstances use the 997 lockable wheel bolt on the 991!
The contact surfaces of the wheel on the brake disc -6- must be clean and free of any grease or paint.
Wheel driver -5- (5 ea.) consisting of driving pin, sleeve and self-locking screw. Only one set (5 ea./for one wheel) is available as a spare part.
Five new wheel drivers -5- (1 set) must be fitted when replacing the brake disc. Does not apply to 911 GT3. Tightening torque for self-locking screws:
M6x30 (911 Turbo) = 14 Nm/M8x32 (911 GT3) = 31 Nm