Yes, it will go 15 MPH on a flat road -- I mean up a steep hill. You have to pedal up a hill in order for the bike to work. We are talking normal streets here though. Steep is like maybe 10 to 15% grade for the bike. If your street was an old 45% grade you can forget about NOT pedaling. The bike needs assistance to go up that hill.

Has anyone blown a fuse trying to get the bike to go up a steep grade? Can you go offroad with the mountain bike and actually get up and down the small hills and vallys on most trails?

Speaking of fuses - what is the exact size of fuse required in the battery pack, and what are the equivalent sizes in CAR fuses?

And how much does an extra battery pack cost?