What do you guys suggest for getting a second set of wheels (rims, spokes and carriers)? I want to get a second set of wheels so I can have a quick switch set of DS tires. I found that my WR has a 19 inch rear rim which is completely incompatible with any DS tire that has street use. So at a minimum I need a rear wheel. Oh and the bonus is that the bike came with four new rear knobbies so I am definitely not getting rid of that for the strictly dirt stuff.