Answer to: The wheel size is 16", isn`t it?No its a small 14" tyre but dont go by the inches size it needs to be done on the other number which is the rim diamater
Answer to: Motor does not work after replace rear inner tubeSounds like the mechanic has messed with the torque sensor, this does not need to be touched when taking out the bike wheel. I changed tyres front and bike without problem. go back to the shop
Answer to: xiaomi qicycle battery replacementThey do appear on aliexpress from time to time.