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You only need protein to help rebuild muscles, this is unlikely to be necessary after endurance training on the bike unless you've been doing really hard stuff like overgeared, seated hill reps. Especially if you come from a weightlifting background.
I still regularly have protein shakes after longer rides, as a) you can never really have too much and b) it controls my appetite and stops me eating 300 pieces of toast in the half hour after getting home.
Thats pretty interesting.
Maybe its my weights/rugby background . But I totally focus on carbs and protein. So a carb Rich protein shake immediatly after, then I'll be thinking Fish/chicken + rice/pasta as a meal later. I Guess I overestimate the importance of protein.
Does help me avoid over eating though.