Year 2 of the TT transformation is off to a pretty good start. All my interval time & testing has been in the Aero position, very close now to my Road bike PD numbers (1 min actually passed my road bike). The fitter I work with has suggested trying out 165's, thinks I may benefit from opening the hip angle up a bit more. I'm currently on 172.5 (for about the last 100 years). I've always ridden 165 on the track and never had an issue jumping back and forth. Seems like a worth while experiment.

Anybody else make this change? Adaptation time? Did you notice an immediate impact?