assuming the larger size does not cause folds or pinches in the tube during install -skill can help a lot here
Then the most noticable difference i've seen is that it takes much much longer for the tube to naturally lose air.
Since the oversized tube is not being stretched as much, the pores in the rubber aren't as wide it seems.
-based on observations of 26x2.1 tube in 26x1.5 tire.
once at work a hand truck dolly got a flat. Didn't have any tubes for the tiny 8" wheels. Took a 24" bike tube, looped it 3 times (same way you fold a tire). 24/3=~8 At only 30psi used on those wheels, it worked great.
Last edited by xenologer; 01-08-13 at 02:46 PM.