Originally Posted by
DiabloScott
Conduction is the heat transfer mechanism that burns your fingers when you grab the rim.
Convection is heat transfer into the air flowing over the wheel.
And radiation accounts for a PUNY fraction of the total heat transfer - the difference between the radiation of black and silver rims is PUNY squared.
Conduction is going on with convection (convection = conduction + flow of material).
(I'd guess that the radiative heat loss is small and that most of the heat loss is due to convection.)