That's pretty sweet. Since we're on the subject... I'm saving up for a Christini AWD 450. Most of my riding is wooded single-track with ruts, roots, and loose dirt. With AWD, I would like to swap the front 21-inch rim for an 18-incher and go wide on the front tire. Off-road... are there any severe adverse effects to running a 120 or 130 - 18 tire on the front, compared to the stock 90 - 21?