I've got 8" 225 40ZR 18 on the front and 10" 285 30ZR 18 on the rear and they went on without spacers They are turbo twists made for the 993 turbo. Don't know weight but when I hefted the stock 17's, that came off the car, they didn't seem that much heavier.
Not a very exciting looking wheel but they do the job.
