one quick stupid question

i used 2.5" spacers in the rear and just flipped the fron wheels over, it almost equalled out to the same as the spacers, so to answer your question the front is wider
 
i hope you didnt flip your rear wheels. you just made your quad more unstable i fyou did by narrowing the rear end. if you flip the front, make sure your valve stems dont hit anything when they go around on the inside.