You can remove and repair / replace the tube without removing the wheel. there is a bracket on the chain side that holds the wheel to the rear of the frame. remove the two cap screws and rotate the bracket and their is enough room to remove the tube. of course you will need to pull the tire bead off the rim and pull the tube out. it is super quick to patch or replace the tube once you figure this out. I learned this trick from an old Italian mechanic back in the 70's when I had my Ciao.