Rodriguez UTB w/26" wheels:
Our UTB touring bikes are designed to fit really wide tires. On the UTB 26" models, you can run up to 2" wide mountain bike knobbies front and rear if you are not using fenders. If you are using fenders, then you can run up to a 2" smooth or inverted tread tire, and up to a 1.75" mountain bike knobby tire.

Rodriguez Adventure series:
On our Adventure touring models you will be able to run up to a 40c width tire on the sizes that use a 700c wheel. The sizes that use a 26" wheel will run up to a 1.75" knobby, or a 1.9" smooth tire. If you are running fenders, then the the sizes are 35c max on the 700c bikes, and 1.5" max on the 26" wheel sizes.