So.. still no news about this kit? Im also pondering idea about such kit.. though I would order a different one, this one:
https://www.aliexpress.com/i/32965870432.html
Seems way better built.. the green urethane part doesnt give much trust for me.
There's also one with narrow roller/wheel (this one also seems to be worth testing, also cheaper than the first option)
https://www.aliexpress.com/item/Booster-200W-With-Battery-Modified-Moped-Kit-Bicycle-Friction-Drive-DIY-Electric-Bike-Brushless-Motor-Better/32950880657.html?fbclid=IwAR26yqLXn7tU8-0JNM8vxvw6lPxmed0vw9qxMYMh5nnhSA9aXmhcJA6hEAI&af=137322&aff_platform=aaf&cpt=1553460279125&afref=&subid1=DPlnKr2ATnM&dp=bafeeb3f002f7bf281064f3d95284304&onelink_item_from=32950880657&onelink_thrd=0.0&onelink_page_from=ITEM_DETAIL&cv=47843&onelink_item_to=32950880657&pvid=c2232730-7c8a-40d9-9bbc-8ebd8af28691&mall_affr=pr3&onelink_duration=0.986617&sk=VnYZvQVf&aff_trace_key=60e4f7dee7824fc2a3acbe0b361080a7-1553460279125-02513-VnYZvQVf&onelink_status=noneresult&scm=1007.22893.125764.0&terminal_id=026a587e77e5478b910b36ab53e6fdf2&onelink_page_to=ITEM_DETAIL
And one with pulley system (gives me the least trust to buy it / try it)
https://www.aliexpress.com/item/200W-Booster-With-Battery-Modified-Moped-Kit-Bicycle-Friction-Drive-DIY-Electric-Bike-200W-Brushless-High/32945061140.html
--
Any feedback would be great.. some anonymous aliexpress buyers have left a few notes but it is not enough to determine its technical peformance.