I just picked up my Honda 2 days ago for a great price and eevn though the original tires are almost full tread I'm looking to possibly go up one size for a bit more ground clearance. I'm going to be using the ATV for Trail riding and yard/garden work mostly. The trails I ride on are pretty rocky and there are a few mudholes around that I may play in occationally.

Whats the biggest I can fit on the machine with NO trimming, rubbing, or lift kit?
Whats a good fairly aggressive tire with good tread life and good ride (I do travel on dirt roads)
I was looking at the ITP Mudlites and wondering how well they are
I've been thinking of 24x9x11's on the front and 25x10x11's on the rear both of which are 1" taller and wider than stock.

 

24's and 25's will work with no mods. I had 25's and 26's with a lift and that also worked well, but due to the hunting laws about tires, now I have all 25's. Some people say its not good when the tire size is diffrent, but I have had no trouble YET.