The reliability of the DAX 125cc as proven in the thread, the tire cost and availability, as well as 'trexuk's' review seem to have made the choice for you! Your link to that sub-$900 one would be the natural choice.

I would guess that if you still had battery power, and had some lights on, and the scooter did not start, it might make you panic if you know very little of bike mechanics (including basic stuff). You might think 'major repair'. That is how one would go about getting a $100 deal like in the thread.

trexuk--I bet you would feel more "out of proportion" riding the other little mini that Skyteam makes (not sure if Lifan used to make these?)

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