I just cracked two of mine and replaced them. I was planning on replacing anyways because it's kinda silly to have wheels that big IMHO. 20s are on mine now and much cheaper along with a better ride. But if you like the uberturbines, go for it.
I remember I couldn't find anything other than black when I was looking. Seemed kinda goofy looking they way they stuck out. I think I checked evannex