Wheel advice needed please
- Thread starter sssammm
- Start date
Dave Wilkinson
New member
Sam,
AFAIK, the 964 Turbo came as standard with 17" Cup 1 wheels in 7" and 9" widths - both with an offset of 55mm. If you have 10" rears they are not standard - and, I suspect, not with 40mm offsets since that would place the inside of the rim dangerously close to the swinging arm of the suspension.
The aftermarket 10" wheels with 47mm offset (usually 18" diameter) are intended for the narrow bodied cars and it may be that you would need spacers to position the wheels better in the wider wheel arch of the turbo body.
Hope that helps.
Regards
Dave
AFAIK, the 964 Turbo came as standard with 17" Cup 1 wheels in 7" and 9" widths - both with an offset of 55mm. If you have 10" rears they are not standard - and, I suspect, not with 40mm offsets since that would place the inside of the rim dangerously close to the swinging arm of the suspension.
The aftermarket 10" wheels with 47mm offset (usually 18" diameter) are intended for the narrow bodied cars and it may be that you would need spacers to position the wheels better in the wider wheel arch of the turbo body.
Hope that helps.
Regards
Dave
Dave Wilkinson
New member
Sam,
It's a difficult one to be accurate. Given that the standard wheels were 9"/ET55 if you put 10" rims on the offset will determine the position of the rim - so with a similar ET55, the outside of the 10" rim will be (10-9)/2, i.e. half an inch, further out. If there is room for an extra half inch over and above the standard wheel you should be fine. Bear in mind, also, that the same wheel will also be a half inch nearer the suspension too so you need to check clearance there as well.
The available clearance both inside and outside will determine where the wheel rim has to be - and that will determine the offset you need. The available wheels will then also determine what (if any) spacers are required.
I'm sorry if it sounds complicated but wheel and suspension design was never intended to be easy!!!
Regards
Dave
It's a difficult one to be accurate. Given that the standard wheels were 9"/ET55 if you put 10" rims on the offset will determine the position of the rim - so with a similar ET55, the outside of the 10" rim will be (10-9)/2, i.e. half an inch, further out. If there is room for an extra half inch over and above the standard wheel you should be fine. Bear in mind, also, that the same wheel will also be a half inch nearer the suspension too so you need to check clearance there as well.
The available clearance both inside and outside will determine where the wheel rim has to be - and that will determine the offset you need. The available wheels will then also determine what (if any) spacers are required.
I'm sorry if it sounds complicated but wheel and suspension design was never intended to be easy!!!
Regards
Dave
Altering the offset at the rear of the car will not make much difference to the geometry. The only negative is on the wheel bearing as the weight may not be equal to each side.
The offset on the front of the car is critical and should not be done incorrectly. Basically the centre of the new wheels (wider or narrower) when viewed from above should be in exactly the same place as the centre of the original wheels were. This means you have to correctly alter the offset to do this.
The offset on the front of the car is critical and should not be done incorrectly. Basically the centre of the new wheels (wider or narrower) when viewed from above should be in exactly the same place as the centre of the original wheels were. This means you have to correctly alter the offset to do this.
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