"Necessary"?
A road bike without aero bars will work fine. With aero bars you will probably be slightly faster (if you have a decent fit and are used to it) and with a TT bike even faster. There are no problems going on a MTB or a citybike, might even be more comfortable if that is what you are used to. It will just take you a bit longer.
A road bike without aero bars will work fine. With aero bars you will probably be slightly faster (if you have a decent fit and are used to it) and with a TT bike even faster. There are no problems going on a MTB or a citybike, might even be more comfortable if that is what you are used to. It will just take you a bit longer.