I have a 2007 Street Bob with a 19" wheel and I want to put a 21" wheel on the front. A friend of mine has a 21" spoked wheel from his 2007 Night Train, will this work and what kind of spacers, etc. will I need to do this.

 

the nighttrain has wide glide trees. You would have to go to the wider triple trees to be able to accommodate the wider hub between the forks. Easiest way to fit a 21" is to relace to your existing hub