I was just wonderiing if i could run 26s in the back and 25s in da front or they all have to be all the same sizes. Wil it hurt anything doing that. It a Rancher 350 2x4 im talkin about if u wanted to know.

 

Shouldn't matter, but you will be changing the angle of the chassis (raising the rear), and that might effect steering in some way (similar to changing the head angle on a dirt bike).

 

If they fit and you have clearance I don't see where you would have any issues with your bike being 2wd. You would most certainly want the tire size the same or have the gear reduction make up for different sized tires on a 4wd model.

 

I was fixing to put 26 inch outlaws on the back cuz it only a 2wd bike. Do all the tires have to be the same brand. I was going to keep the front tire witch are 25x8x12 dunlop quadmax and change the rear to outlaws so I have better traction in mud.

 

You can mix them.

My experience with the Rancher, has been that when you put huge tires on it, usually it ruins the quads sweet handling characteristics! Folks buy it because it has a reasonable size and price, then try to turn it into a mud monster or something, which may be a mistake(????).

You will of course be raising your effective gearing, so you will lose low end power, but gain some speed at the top end.