Originally Posted by
ScottCommutes
Paradoxically, the bike holding you back makes you stronger. I don't think you develop bad habits on an older or heavier bike, you just get fitter faster because you work harder.
Nope. If that were true, we'd all be training on 50-pound bikes.
OP: A new bike that is lighter and more aero might make you only marginally faster...But, if you are getting more serious about cycling, you will likely find that a nice new bike is better in other ways -- especially if you get a proper bike fit when purchasing it. And you might also appreciate having two bikes -- the older one can be a backup bike, a rainy day bike, whatever.