18" rear wheel

[rmaq]

Hi, I am wanting to throw an 18" rear wheel on my 2012 rmz250.... what rims would be a good starting point? Drz400 rear rim maybe? Can I get away with it without lacing hubs and rims from one to another? Axle bushings and spacing shouldn't be an issue as I can make them myself...

[dubsy]

Rmx450z