How you deal with tubes depends on the availability of your tubes where you are driving. Fortunately on my Enfield they are the same size front or back, BUT they are not a common size. I have learned to change both the inner tube and rim tape with each new tyre and carry at least one brand new spare tube.
I also carried and used a tube for my tubeless BMW as it would sometimes unseal between rim and tyre. Only the front, rear worked fine. Neither me nor the local BMW agent could effect a permanent fix other than by buying a new wheel. I chose the tubed route.
A tip that seems to have been forgotten. It is worthwhile liberally dusting both the outside of the tube and inside of the tyre with talcum powder when fitting.
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