Shouldn’t you start off on a scooter if you need training wheels?
Maybe it’s modified for someone with a disability?
I don’t think it’s a training wheel. It looks like the kind of fifth wheel sensor used for various road testing adapted to a motorcycle. Example:
They are far more accurate than the factory gauges of vehicles and used for a variety of specialized testing. Don’t know if he’s trying to test something about the bike or if he just wanted to use his bike to do the testing.
That is an anti-wheelie wheel. Funny cars have something similar. That bike is so powerful, it would do backwards cartwheels if you are accelerating quickly, as in drag racing or in timing events such as the quarter mile.
It is a bike stand. Used to hold the bike upright and allow movement without effort of holding the bike upright.
There are a number of styles and brands of this.
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