Aren't they 17" diameter by 7.5J which would be 8.5" so 17x17x8.5 plus the size of the box
the "Comps" are the forged type and they weigh about 9.8 Kg each or 21.5 lbs. Some of the other cast 7.5 x 17 TT alloys weigh in at up to 13.2 Kgs each !!
they didn't feel like 12kg to me