245/75/16 tires to 265/75/16

Depends on if you drive a 1500 or a 2500 ... if you go from 245 to 265 on a 1500, there may be a little catch on the front fender wells when you make deep turns - I just trimmed the well edges about an inch or so, and no problems.

Am not sure rims are an issue - but it's certainly doable ... My 2003 GMC 1500 came with 265's, my 2003 2500 came stock with 265's, and my 2015 2500HD came stock with 265's ...