My Genesis is a slack CX bike, I rode this on forum ride/audax.
When I got on my road bike, I was able to push myself even further without trying hard due to getting used to riding a very heavy steel CX bike whose geo is closer to a tourer than audax.
Perhaps old road bike are a great way of pushing yourself, but I don't race (yet) so can't make a fair comparison.
DFP kinda have a point.
My Genesis is a slack CX bike, I rode this on forum ride/audax.
When I got on my road bike, I was able to push myself even further without trying hard due to getting used to riding a very heavy steel CX bike whose geo is closer to a tourer than audax.
Perhaps old road bike are a great way of pushing yourself, but I don't race (yet) so can't make a fair comparison.