I am a Padi Dive master, and i have to agree that carrying a air cyclinder (or any gas) would be a very bad idea. Not only is there the crash issue, it is also not recomeded to let your cyclinder stay in direct sunlight for to long (heat and uv degradation). HOWEVER on most courses you dont bring your own gas, and will need two or three for a days wet work, so there i no way i could see getting two on a bike. Besides you will not be covered on your insurance, you must carry any cyclinder in a safe way with a label on the outside of the car.
After saying all that negativity, if you are only talking wetty, fins, mask, BCD. then i would go the simple route. I carry all that gear in a large duffle bag, make sure that it is water proof, like the north face one, and strap it to the rear rack.. No worries, just keep your led low aand centred. This is so that 1) you can keep your bike salt water free, and two keep your gear WET until you can fresh water clean it ( you never want your gear to dry with salt still on it).
go for it and keep diving.
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