I have a 20 inch folding bike (406).. How much load can the wheel handle? I am an adult with 70 kg.. Sometimes i carry my kid sitting on the rear rack, worrying that the tyre will burst one day.
The maximum load on the tyre wall printed 65 kg max load though.
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All the suggestions here are good, but actually Puppy Linux is also a good start. Try their latest BookwormPup64 release, it is very polished, solidly build, and most importantly small enough to install on you usb pendrive. Puppy linux runs in your ram, so it is super fast even on old basic hardware.
Give it a try.. I start using puppy after my pc crashed... Never look back to windoz since then..