The tires are 275/65/20. They fit pretty good. I may go a bit wider next but not sure. I like the overall look, so may not fix something that isn’t broken. I have a -25 offset if that helps at all. As far as the step bars, I haven’t had any problems so far. I wonder if yours were over or under torqued when they were installed???? Mine are nice and firm even with bigger guys getting in and out of my truck.