I have a radrunner 1 eu version all it shows on the motor is rad power bikes 20-210622 0617 1 what does this number mean and what motor is this please.
I have no idea what the numbers mean. However, I suspect they are some code either Bafang uses to identify which of their motors go to Rad bikes or they are used by Rad to determine where the bikes are sold. Ie: your bikes in the EU would be coded different from those sold in the USA or Canada. Each of us has different maximum wattage allowed on our bikes.
The motors are all virtually the same. 500 Watt motors nominal and about 900 watts maximum. It doesn't mean they can't handle higher wattage, just that they can operate at that level for long periods of time without overheating. The difference is in the controllers. EU are set for max 250 watts, Canada 500 watts and the USA is 750 watts. Other countries may be different.