Hi. Thanks for your reply.
I just want a slight boost on some hills during the commute without spending a fortune. I've read a few downsides to the friction drives, but for the money it seems that it could be an option.
It's the standard Revos conversion kit:
https://ebiketips.road.cc/content/reviews/e-bike-conversion-kit/revos-ebike-kit-with-200wh-battery-3699
However, I think I may struggle to fit it to the BTWIN Tilt 120 due to the build.
Thanks.