Bicycle registration is a bit of a hot button dog whistling topic these days. It’s been tried and dropped in WA in the past, but the relics of the experiment live on in a few club members’ collections. If they’re still hanging off a bike they could help establish the bike’s age or origin.
There was no made road across the Nullarbor and at one stage they spent two days wheeling their cycle through heavy sand. Another section was pitted with camel tracks; sometimes the country was overgrown with brush and near the Madura Pass the jagged edge of limestone had been exposed by strong winds.
Do not worry about the size of your chainwheels. The actual gear is the most important. If you have 8 gears, you should have from 68 up to 96” with the vari- ations from one to the other as regular as possible.