Islander, if you change the wheel size in the display to 29, you will get more top end in throttle mode. Were you running lower air pressures when you were getting that wobble? Peddling or coasting?. I had some wobble at similar speed while peddling.Tire pressures were low because I had been off road earlier. Maybe tire compliance? I later coasted down several short hills. Held my line very carefully awaiting wobbles. None at 60 kph. Dead end roller coaster road I live on. Wouldn't consider doing that speed in traffic. 30-40 kph is plenty on the road with traffic