53-39, its a 14t jump, if the difference is less it will shift smoother..
Paris-Roubaix gear .. 46-53, or Cycloross gearing .. 46-39..

Technique: rather than parts..
shifting may need some terrain reading.. to shift Up,
when the chain is less under strain, on crests of rises, of the road.

pedal-Less-strong, for at least a moment, for the FD shift..