Does anyone know wether you can buy a rear Chris King BMX hub with disc mount that fits a mod 20" bike? If so,would you please post some pictures of what they look like PS.I have been looking on this american website called www.aspirevelotech.com (i think thats how you spell it and i saw this chris king single speed rear hub and was wondering wether that was the hub i need to use, and would it fit a mod? Infomation please