Can you post some more details?
AFAIK, stock 197 wheels are 11kg, and the Cup ones are 9kg.
when i brought my 17x7.5 ET45 pro race 1.2s they weighed in at about 8.4kg a wheel without tyres, when i had my existing tyres swopped over i weighed my standard wheels on the same scales at home and they weigh in at 10.2kg per wheel and that was with there balancing weight still on (whether that makes a difference)