Will these weels fit my car?
- Thread starter cococola
- Start date
Paul Fraser
New member
I think the offset changed with the '87 model year didn't it? (October 1986 onwards, or was the new model year August 1986 in those years?)
Before that you'll have ET23/17 front back, after that it will be ET50-55ish.
If the cup 3 wheels (like this: http://www.pistonheads.com/sales/396152.htm?) are 996 or Boxster ones then they won't fit (well, not without big spacers, 40mm ish).
You can probably find markingings beside the valve stem if you have Porsche wheels on your car at the moment -- something like 9J/ET55 which give you the wheel width and offset. Get this information and the same from the set of wheels you hope to fit and go to: http://www.1010tires.com/WheelOffsetCalculator.asp and plug the numbers in. Then when you get back here and tell us you need huge spacers we can all tell you how you'll go through a set of wheel bearings a year (didn't stop me...)
Note that there are cup3 replica wheels out there with offsets of 17 or 23mm (I forget which but it doesn't make much difference). Have a set myself and they bolt straight on early offset cars.
Any other questions just ask.
Before that you'll have ET23/17 front back, after that it will be ET50-55ish.
If the cup 3 wheels (like this: http://www.pistonheads.com/sales/396152.htm?) are 996 or Boxster ones then they won't fit (well, not without big spacers, 40mm ish).
You can probably find markingings beside the valve stem if you have Porsche wheels on your car at the moment -- something like 9J/ET55 which give you the wheel width and offset. Get this information and the same from the set of wheels you hope to fit and go to: http://www.1010tires.com/WheelOffsetCalculator.asp and plug the numbers in. Then when you get back here and tell us you need huge spacers we can all tell you how you'll go through a set of wheel bearings a year (didn't stop me...)
Note that there are cup3 replica wheels out there with offsets of 17 or 23mm (I forget which but it doesn't make much difference). Have a set myself and they bolt straight on early offset cars.
Any other questions just ask.
AndrewS
Member
Hi Alan,
Cup 3 18" alloys are available in various off-sets (the ET measurement). If you are referring to a specific set, you will need to check the ET value for each (front and rear) to see if they will fit your 1986 2.5 model. Assuming your car is non ABS (as most 1986 944 models were), you would need wheels that have an ET equivalence to your original wheels ET23mm
The idea is that the centre line of the fitted wheel is in line with wheel bearing. Hence, wheel width also effects the final result. If the wheels you have are ET52, they will be too inboard.
Hence, we need to know the respective widths of the wheels and the ET value before we can determine if they fit.
See diagram below to help.
Regards,
Andrew
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