So I spent a few years riding a road bike (Cervelo S5) on "aero" position with clip-on aerobars. I had no issues with the position or the bike but wanted to give triathlon bikes a try to get some "free speed" on long distance racing (half/full Ironman, so 90k and 180k).
Fast forward to going to a bike store last winter and getting fit into a tri bike (Cervelo P3). I spent about 5 months riding it indoors on my bike trainer (3x week, between 4-6 hours) and I felt really strong (no pain on aero, etc.). But then outdoor season began...
Issue is: I can't get comfortable on the bike. I've done 6 rides so far (from 50km to 120km each) and the bike is all over the place, can't get stable and feel very uneasy unless i'm going straight. Going to/from the aerobars to the handlebar is the biggest issue and I already fell once due to slightly uneven ground, i just lost control of the bike so it's not just all in my head.
Any thoughts whether this could be a bike fit issue or just need more practice? I'm wondering if the bike is too tight for me, would that cause these issues? i "look" very aero and compact, but that's totally pointless if i feel near death all the time. Any ideas?