Summary

My son had the crazy idea of using his old hoverboard to make e-bike with his small childhood bike
Video of it working here https://www.youtube.com/watch?v=-ZQxsT7qDhU

You will need
Battery
https://www.aliexpress.com/item/1005007255255358.html?spm=a2g0n.order_detail.order_detail_item.3.6370f19c1Gin2X&_gl=1*1ymtna5*_gcl_au*MTU2NDYwODg1LjE3NjEzOTcxMDI.*_ga*MTUwNTg4NTk5LjE3NjEzOTcxMDI.*_ga_VED1YSGNC7*czE3NjIyNDgxOTkkbzYkZzEkdDE3NjIyNDgzNDQkajE2JGwwJGgw
Speed controller
https://www.aliexpress.com/item/4000143351840.html?gatewayAdapt=nld2glo
Momentary switch for electric break
https://www.aliexpress.com/item/1005009675327555.html?src=bing&aff_short_key=UneMJZVf&aff_platform=true&isdl=y&albch=shopping&acnt=135095331&isdl=y&albcp=555190543&albag=1304021950430056&slnk=&trgt=pla-4585100935181475&plac=&crea=81501428383613&netw=s&device=c&mtctp=e&utm_source=Bing&utm_medium=shopping&utm_campaign=PA_Bing_UK_PLA_PC%2FM_LBFC_gb_bing_gxpc_MaxValue_20241125&utm_content=gb_bing_gxpc&utm_term=12mm%20Push%20Button&msclkid=c01664ba4c5d1c49580e0daae296ead3

You will also need 19off M8 brass inserts

The yellow switch on the left handlebar is an electronic brake.

All pats printed in PLA.
Most parts I printed at 20% infill, however the arm to the motor I printed at 45% for strength.
The metal bracket by the motor is from inside of the donor Hoverboard.

When you first connect the speed controller it will likely be set for 48V and you will need to change to 36V.
Hold power and mode until P starts flashing. Press Power until you see P3 which will probably say at the bottom '48' meaning 48V. Press mode until this reads 36 then press and hold power and mode together for 2 seconds until this is stored.