Originally Posted by
2old
Back to your original question, a BBS02 mid-drive should satisfy your requirements. You might want to add a front fork depending on the terrain. This system on a steel MTB has served me well for six+ years including yesterday. I use either a 52V, 14 ah or 52V 4 ah battery.
Coolness. 99.9% of my riding is on pavement and all of my rides are fully rigid, so that isn't an issue. I'm really looking for torque(?) and range over speed; 15mph is plenty for me.