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Things you need to know about Porsche 928 wheels
Contents
Warning - 18inch wheels are not supported on the Porsche 928
The mysteries of Wheel offsets for the Porsche 928
Pictures of the standard 928 wheels
Porsche 928 RDK System
Installing 17in wheels on 87-91 Porsche 928's
Warning - 18inch wheels are not supported on the Porsche 928
Retrofitting 18in wheels on Porsche vehicles which do not have 18in wheels as original equipment is NOT ALLOWED in main dealers. "Endurance tests have shown that
equipping certain Porsche vehicles with 18 wheels in an application not already approved by Porsche Cars may result in loosened bolts and /or threaded connections, on the
front wheel carriers. This, in turn, may cause fractures in these components. Fractures may also occur in the front strut mounts and in the body in the area of the rear
suspension as a result of the installation of 18in wheel not already approved for installation for this sp ecific application.
Such damage can occur without warning and the vehicle may become very hard to control or steer as a result of this Improper i nstallation."
Source: Technical bulletin 9305
Offset
This is the difference between the centre of the wheel and the position of the hub within the wheel.. The spacing requirements of a 928 are unique - you cannot take wheels off
a 911 or 944 and bolt them straight onto a 928. If the spacing is out then the wheel and tyres will contact the bodywork over extreme bumps or when turning causing expensive
bodywork and tyre damage. In this scenario you will need to fit spacers and these can cost around 400 alone, so beware. When buying wheels make it clear they are to be
fitted to a 928. If buying from a reputable supplier they should be supplied with the correct spacing built into the wheels so just they can be bolted straight onto the car.
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