Kyowa doesn't advertise the weight of their wheels, you got to call em. I read a couple forums and Kyowa says their KR316 17" wheel is about 19lbs. Thread didn't mention width but my guess is that 19lbs is for a 7.5 wide KR316. So, if you go 18 on the Kyowa, say about 20-21 lbs., possibly 22?
Racing Hart Evo C2 = 18" x 8.5 ==> I keep seeing 21.5lbs.
.... I want to say I read, wayyy back, that Kyowas are kinda soft. Don't know about the Racing Hart Evo.