Thx Yo !Most will tell u not to( cause there is no front brake) but my eye caught a dudes bike on this site and i just had to do it ! I looked around on a ton of sites but the #'s where just not matching up, until i ran across a dude on Craig's list that was selling a 21'' . To make a long story short he know a lot about 400's and had access to many diff. parts and in order to make all things work he laced me up a 21'' wheel on a 15mm spool hub . I still have yet to complete it cause i just moved to Florida to go to school but it wont be long ! I will tell u one thing , U will have to find sum1 to mill u front spacers to make it all work . Good Luck!