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Depends on your equipment, but potentially you can have quite a lot of water in the hub bearings, BB bearings, pedal bearings and freehub bearings, and it tends to stay there and cause problems. Cartridge bearings with rubber seals tend to be OK, and anyway doing anything about it is the work equivalent of replacing them, so you might as well wait and see. Any loose ball bearings should probably be dismantled and regreased.
Failing that, if you can get the bike into a drying atmosphere for a good while (elevated temp, depressed humidity) you might get all the water to evaporate spontaneously before it has time to do too much corrosion. Riding on wet bearings tends to create an emulsion which won't dry out, so if you had far to go after the ducking you're best to pull everything apart.Definitely pull the BB on steel frames, even if the bearings are sealed, water trapped in the BB shell is very bad news.
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Depends on the axles and how much you, sorry, your friend, cares about the bike. You’d want to disassemble the hubs in any case, to let them dry out and get any stuck water unstuck.
Easiest would be loose bearings - just take apart, clean, regresar and reassemble. Would do the same to the freehub and RD jockey wheels if you can.
Sealed bearings you can still clean and regrease but they take a bit more effort, especially if they’re pressed into the hub: pry off the seal, clean with degreaser and a brush until liquid runs clearish, regrease and reseal. Alternatively, wait until they break and replace. Still worth airing out the hub IMO.
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gbj_tester
Eseman
@jellybaby
Obviously one should never ride through flood water as it is hazardous in many ways but hypothetically if you did and it was deeper than one anticipated and over ones axles what sort of bike remediation should be carried out afterwards? Asking for a friend.