These go to 11.
Join Date: Feb 2006
Bikes: 06' Trek 7.5 FX, '09 Dawes Steel SST
Different size tires require different size tubes & the range of sizes varies from manufacturer to manufacturer. As long as the tube is within the range that your specific tire needs you will be fine. I say to go with the smaller range within your size requirements to save some weight, i.e., a 20-25 tube -vs- a 25-30 tube if you run 25mm tires.
Melancholy is incompatible with bicycling. ~ James E. Starrs