My worst experience using a smaller inner tube was putting a 20x1.50-1.75 inner tube into 20x2.125 tire and it resulted in the tire popping off the rim which resulted in permanently damage.
My worst experience using a smaller inner tube was putting a 20x1.50-1.75 inner tube into 20x2.125 tire and it resulted in the tire popping off the rim which resulted in permanently damage.
