Re: what did you do to your motorized bicycle today?
Put a tacho on it to see when my engine vibrations start. Turns out it's at anything over 4200. I thought it might get a bit higher than that before shaking, but it'll do. I'm gonna gear it up from a 39 to 32 tooth (24" wheel). My quick maths says I should get about 40kmh out of it then, which is all I want. It seems to have good torque surprisingly so I reckon the combo will work ok.
Doing that daily listen-out for the posty that I'm sure many others here have done before.