You are braver than me. I don't mind going that fast on my motorcycle with full gear on, but not a bike. The fastest I ever got my bike (mtb, off road tyres 44t front ring) is 51.5km/h on a slight downhill pedaling as fast as I possibly could... felt like just spinning. Just going that fast was enough for me. I'm sure on a steep hill with no traffic I could do better, but I feel that 30mph+ on a 2 wheeler wearing cycling shorts and a Jersey is asking for road rash