1. How do I know if hub motor fits for my bike?

This hub motor fits for the bike with front drop out size "100-105mm", and rear drop out size "135mm" fits for max 6/7 speed rotary flywheel. (Fat bike : front 135mm, rear 170/190mm)

2. Is my brake a hydraulic brake. Should I choose the brake lever or the sensor line?

If you have a hydraulic brake, you can choose the brake sensor cable, which is easier to install.

3. How to know the rim is suitable for my tire?

Re: Check the item description below, there has the information about rim.

4. How to find the wheel size?

Re: Choose based on the size on your tires. If you can't determine the size, you can take a photo and ask customer service.

5. My bike is 28 inch/29inch, which one could I choose?

Re: Mostly, you could choose the 700C rim (inner diameter- 598mm, outer diameter- 652mm). But you Could send us the detailed specification of your tire for confirmation.

6. Does the kit include the battery?