Originally Posted by
concordino
Just been to a local bike shop to buy inner tubes for my upcoming 700D project. The technician said that 26x 1-3/8 should fit in the original GT tires.
Can anyone please confirm this ? I tried buying 27.5 inner tubes but the slimmest I found on the market was a 1.75.
ETRTO 590 (aka 650A, aka 26 x 1 3/8) inner tubes will fit fine, you are talking a 3mm diametrical (1.5mm radial) difference.