I have a chance to trade my stock 25 in rawhides for a set of ITP 27 in 589s with 90 % tread my stock tires have only 250 miles on them. I do some road riding, I would be dumb to not trade right? And does it affect my warrenty?

Warranty depends on the dealer, but as far as the tires go they are a great upgrade from stock. The have a lot of bite in mud with a bottom and wear like iron. It would take a while to wear them out. They will ride quite a bit rougher than stock though but a good trade for sure.