true if you are careful you wont break them.there are guys here running 35+ in tires with stock running gear and they do just fine but better safe then sorry right??
if youve ever broken an axle out in the middle of nowhere and had a long ways to go to get home you would just get the inners too. not that much more money and then you will have extra inners and birfs and although you probably wont anytime soon if you break one youll be okay because you have your extra stock ones. or just be careful. whatever.