don't go cheap on this mod...just because you can get a good price doesn't mean you should. There are too many problems. Just hold out til you find a good deal on a nice set. I found some 19x8.5 Stern ST-1s recently for cheap. You'll be glad you waited...

 

I did not look at the offset for these wheels. However, I can assume that they're for a tC, they're about 40-45mm. Stock G 17s are 45mm. So it's a wash.

Personally, I'd never run adapters regardless of the wheel. But since I do have to recommend adapters from time to time, they'd have to be a minumum of 25mm thick; what H&R runs. That will give a final offset of 15mm if the wheels were 40mm offset and 20mm if they were 45.

Okay, you got me. He will not need to pull fenders, but he WILL need to roll them. All this work and extra cost to get a 'deal' on some wheels? If he took the money that he'd spend on wheels, adapters and fender work, he could have a set of wheels that fit and look proper on the car.

Please use some common sense before you call someone out. I collect and rebuild BBS RSs and sell them, mostly to the BMW and VW community. Offset is everything to these guys, so I need to know them well enough to get the barrel/lip/face combinations I make. I wouldn't be selling wheels if I didn't understand offset.