Originally Posted by
bigdufstuff
The only thing holding me back is that I'm a little concerned about putting the 48 tooth chain ring from hitting the chain stays. Is there any way I can measure my bike ahead of time to know if this will be an issue?
A 48t chainring is almost exactly an inch larger in diameter than a 42t chainring. Measure 1/2" back along the chainstay from the inside of the 42t chainring. That is where the 48t ring will sit. Depending on your chainline now, the new ring might move in or out, so you may want to measure your chainline as well.