the furthest i'd go is 3 ", my buddy has them on his ltz 250, and i have to say, they held up friggin awesome, his motor is now dead, the spacers live on, haha
i wouldnt gp that wide on a blaster bud, thats getting ridiculous, i have the 1.5 on each side of my front and a banshee axle in back and its awesome, plus if u trail ride ur gonna get snagged up with it that wide...