Took my birdy to Yeosu to ride a grandfondo, riding together with road bike riders

My bike: Birdy standard 2013, 54T Single chainwheel, 11-34T Sprocket, Schwalbe Kozak tires, ridenow tubes, carbon fiber seatpost

01:59 my birdy bike
02:53 riding along coastal line, starting intervals
04:00 taking the lead
07:40 uphill & downhill & fall