Stay with the stock tires or maybe 25s no more, you will start to lose power, We werent that impresed with the pulling power of the AT Rancher, hooked up to a down tree in 4x4 and gave her the berries and it wouldnt spin the tires at all other wise seemed to be a good machine. All I can say is Hondas are the most reliable quads out there, my freind has a rubicon with 12000 miles on it yes not a typo 12000 miles. Not to bash polaris but every time we go riding with a polaris, if its not brand new they break down. Honda is not a power house or the fastest or maybe not the best ride but they hold up to everything.