I'm thinking about buying a older Boxster as a daily driver. I have a set of Champion Motorsports RG5's laying around.

The fronts are 19x8.5 and the rears are 19x11. The tires are: 235/35-19 front & 275/30-19 rear. I believe the front offset is 53mm and the rears are about 60-64mm. I could be a little off on the measurements, but close.

They fit my NB 993.

Will these fit a Boxster?

 

I doubt the rears will fit. I have 285/30-18 on 10.5" Techarts with 47mm offset. I think yours will stick out almost an inch further (between the extra offset and width) and be taller and I don't see that working, IMO. I think the fronts would work.
Good luck

Randy

 

A 275/30 on a 19? Seems a bit narrow. Generally, I'd say there's no way an 11" will fit a 986 without body modifications. As much as I love my RG5s, I don't think your 993 wheels will carry over.

 

I think you will need a lift kit.