Originally Posted by
cobba
Bit of wrong info there.
Not seeing any tabs for mounting disc brakes, could be, given that the trek site only has a drive side photo, but IS tabs should still be viable.
2013 3500 - Bike Archive - Trek Bicycle
For the OP, being realistic, if you wanted discs, you bought the wrong bike, upgrading
if the frame has tabs would require new wheels in addition to the calipers/rotors.
For rim brakes, I was out this morning off road with a mid-90's bike which has rim brakes, stopped me fine when needed. Would want discs if riding with others who have them, or if in the rain a lot, but in the dry, rim brakes work almost as good as discs.