Tektro CR720 Cantilever Brake Question
 

I was wondering if there was any difference between the front and rear brakes, specification wise. I have a chance to pick up 2 rear sets cheap and was wondering if the rear is different that the front? Could I be use the rear on the front without issue? The sets are normally sold front and rear but I could not find any tech info on the Tektro site regarding any differences in reach, adjustability etc.

There's no actual difference other than the way they're put together in the box -- you'll just have to swap the left and right brake pads for the set you put on the front (they have a label showing which end of the pad should face forward.)

They are the same, just flip the pads.