Wow!...my '02 Warrior is 5.3" narrower than a YFZ450R, 3.6" narrower than a YFZ450X, and 3.7" narrower than a TRX400EX/X. No wonder it feels like it wants to tip over in a turn. With OEM wheels, +2 front arms, and 1.75" rear spacers it's still 1.8" narrower than the YFZ450R. Interesting...