Changing Wheel Offset?

[rawky]

I have a Porsche 928 S4 with the normal bin lid wheels, and I am thinking about changing the wheels. But all of the wheels that I would like, eg. D90s, have a too low offset. On the 928 they need to be et65, et55s fit but have been known to cock up the handling.
So, would it be possible to have someone turn the wheel on a lathe and actually increase the offset?, adding spacers lowers the offset on Porsches if its different elsewhere. Or is this going to waste time and money? All advice appreciated....
Cheers

[B19GRR]

I guess it's theoretically possible, however it's going to have a major impact on the strength of the wheel, not something I'd like to be messing with.

Cheers,
Rob

[Uncle Fester]

Wheel manufacturers start off with blank castings and keep these in stock.

You then order them to fit a certain car.

They then machine off material to produce the offset required, plus PCD and the rest. Then they apply the finish.

The point is that you can have any offset you like, within a range that they know to be safe. If you ask for an offset that requires more material machining off than they have tested as safe, they will just refuse to supply it.

Getting a set and having them machined yourself is possible, but risky. You might take off more than is safe.

Just talk to the maker and order the right offset. The off the shelf packages might fit if you get lucky and have a common car.