I just picked up my bike this past Saturday, had the dealer install the tires on the stock rims before I picked it up. I never rode it with the stock's on it but have ridden others that way. I have 26X9-12 on front and 26X10-12 in the back. Notice, TEN inches wide in the back not twelve like most. This is a lighter tire that's not quite as fat (still considerably large) yet it doesn't sling mud all over the side of the bike outside of the fenders since most of the tire is covered up so I've stayed very clean so far (not realy a big deal to me). As for power, I honestly have not ridden this model of bike with the stocks much to compare to what I have now with the new tires but all I can say is that what it showed me it's capable of this weekend proved all I needed to know. With both of us on it (sorry, breaking the rules huh?? haha) we romped through the swamps through the creeks over the logs in the creeks and it was just stupid what it was doing. Most of this was done in 2WD and with 4WD it just made what was easy....easier. Happy to answer any more questions. I'm by no means claiming to be a tire expert, just sharing my 2-cents of what I've experienced so far on it. Feel free to PM or email.

 

Yes they will fit I just got a brand new pair of 26" mudlites put on my honda foreman 450 but as i said I just got them I have rode with them on there but I have not had a chance to try them out in the mud

 

I've run 27" Blackwaters on my foreman 450s, and now I'm running 27" Mud Lite XTR Radials. These are the best tire I've used yet in all condions, mud, water, snow, and we have all Peat Bog here. Never had an issue with power loss. THe only tire I've noticed a signifigant problem like that was my freinds Foreman 450ES, he ran 26" Mudzillas, when they loaded up in the peat bog you could ONLY use 1st gear. He's now running XTR radials and is much happier.