50mm best all-round, plenty aero but quite a few lightweight options still. If you are ordering and can get a custom set, 50mm front and 60mm rear is my fav. I've lived in Joburg and the Kaap, strong winds are basically non-existant in Jhb. In Jhb I would not hesitate to go full aero if that's what I wanted to do - as in 64mm front and 80mm rear. That's IF you wanted to go full aero, this setup would be quite heavy and maybe not as aesthetically pleasing depending on how extreme your taste is. It would kill on a flat course, though.