Cycling S Africa

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Hi I'm doing conservation volunteering near Capetown in late November-December for 2 weeks and would like to see more of South Africa and possibly Namibia beforehand. I am into cycle-touring so can people comment on 3 possible scenarios
- 3 weeks or so riding from Johannesburg to Capetown
- riding up from Capetown to Windhoek in Namibia (then probably flying back)
- a 2-3 week loop from Capetown.

I am an experienced cycle-tourer and am used to hot weather(!). Not so interested in cities, wineries,etc, more into wild scenery, animals, historical places etc.
Any comments on taking a bike on public transport in SA, too.
Thanks
Mick