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Decent three-wheeler bikes have the two wheels at the front, so rather than training wheels, you have increased traction. Both of these bikes are highly rated:

https://en.wikipedia.org/wiki/Yamaha_Tricity

https://www.revzilla.com/common-tread/2018-yamaha-niken-firs...

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I think Piaggio were the first with a modern two front wheels scooter in 2006. They also had a hybrid plugin model doing 0-60 in 5 seconds (2008).

https://en.wikipedia.org/wiki/Piaggio_MP3

It should be noted that both those three wheeled motorcycles lean while turning, making them functionally very similar to two wheeled motorcycles in operation. This makes them much more stable compared to a non-leaning three wheeler.

They're more stable until you broach their lean angle limit.

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