i have an older model schwinn traveler. im not sure about the year bc it was given to me for free from a friends parent. it is a 12 speed. im wanting to start doing some riding again and want to do some triathlon races so i wanna upgrade the bike with some newer parts to get it to run better. i also wanna add some aero bars. i dont wanna spend much money and wanna keep the frame as much as possible. does anyone have any ideas i can use and about what im looking at in cost?