Here is the answer from Radpowerbike EU, thanks.

"You have probably informed that Throttle can go full speed, and that is true but here in EU we call that Twist Power Assist.
Twist Power Assist on the European versions of the bikes is limited to 6 km/h. This means the Twist Power Assist on your bike will serve a walk assist function, or to give you a boost when you are starting off. This limitation is done so that the bike can be categorized as a standard e-bike throughout Europe, and does not require any registration or insurance."

Definitely a bad customer experience.

"... US webstore, which is a different branch from the EU one - from which you ordered. As the European webstore was established only recently, there are quite some differences between the two - including the RadRunner

Thanks for the answers. This is my first e-bike therefore I have lack of knowledge regarding general e-bike behavior. Let me ask this question first. Does the Radrunner allow riders to go without pedaling only twisting the throttle? If yes then I have a problem. Thanks

I just bought a new one and I think it supposed to move without pedaling on PAS0 mode?

I am quite confused, people who bought Radrunner plus received passenger seat and foot pegs but i did not. Maybe someone from Radrunner can enlighten us?

Hello, I have a question. I ordered Radrunner plus.

Radrunner Plus Standard package includes ( NOT The RadRunner Plus Limited Edition)

1. Passenger seat?
2. Retractable footpegs?

Thanks in advance

Hello, I have just bought Radrunner plus but while I am pedaling the chain is slipping. Is it related to pedal assist or ..? thanks