May 05, 2016· 18″ rims: 305/70 R18 – 1.2 inches wider and 2.8″ taller than factory. There are Tundra owners running this size, but trimming is required. Replacing the stock wheels with after-market 18′s that have less backspacing is recommended. 20″ rims: 285/65 R20 – 4/10ths wider, 1.6″ taller than factory.
