Hi folks, I searched around, but didn't find evidence of someone retrofitting an 18" rim to the back of an XT250. I'm looking at the XT550 rear rim. The brakes look the same, but I'm wondering if the dimensions match up. I think I'd have clearance for the 18" rim, with a slightly lower profile tire. Mainly, this is to open up tire choices, as few manufacturers are doing 17's anymore. Any thoughts?