I'll admit right off that I know nothing about rims and tires. That said, I bought a Fargo a year ago with 29" 2.25 wide tires. Love the bike, but the riding I'm doing now is a lot of pavement and bike paths. The big tires are comfortable, but they seem like overkill for what I'm doing, they seem slow, and they are very noisy! I'd like to put on something more road like in a 38-40 mm tire. I have no idea what the rims on my Fargo will allow. I don't want to have to buy new rims or wheels so does anyone have some info on this?