Friction Drive for a 20inch Tire

[bluck]

Hi guys I was looking for a friction drive kit for a bmx bike that has 20 inch tires. I was hoping to get a 49cc motor on it. Let me know if such friction drive kit exists I tried looking for some but could only find for 26 inch tires. If I have to downgrade to a smaller motor thats fine too.

This is the bike:
http://fitbikeco.com/bikes-2017/vh-1/

 

[5-7HEAVEN]

I ran a Subaru 45cc engine and friction drive on my 20" Dahon folding bike.

Any rear drive kit will fit 20" bikes, even chain drive.