Based on the info I found in this thread... http://www.civicx.com/threads/factory-wheel-size-offset-and-weights.1636/
It seems they would roughly weigh about 26.2lbs. If the stock tires on Touring=EX-T, and someone determined their Touring tires weighed 22 lbs., then 48.2-22lbs. = 26.2lbs. (Though, the actual weight wasn't validated, only by deductive reasoning).