Here is the completed All-Wheel-Drive E-bike for use on St Thomas, U.S. Virgin Islands. St Thomas has some of the most extreme hills in the entire US. Elevations go from the Caribbean Sea at 0 ft (0 m), to the highest point: Crown Mountain (Saint Thomas) at 1555 ft (474 m). The island is only about 14 miles long by 5 miles wide so most of the land mass is vertical. If there ever was a need for an all-wheel-drive bicycle, this is the place. I completed this cargo bike build last night and took it out for the maiden voyage this morning. The Bafang BBSO2 mid-drive motor was used as the primary with pedal assist but whenever I encountered a really steep hill, I would throttle on the front hub motor in low gear to help pull me up the incline. This worked remarkably well and I was able to cruise effortlessly all the way to the top of St Thomas at a comfortable 12 mph without breaking a sweat. The front hub motor never reached temperatures greater than 52C (126F), which is well below the cut-off temperature. The small sine wave controller and cables fit easily into an Ortlieb saddle bag with plenty of room for a few tools and a spare tube. The front disc brake was a bit tricky. I had to dish the wheel to allow 10mm of extra space on the non-drive side to fit the disc rotor. Even after allowing for the extra spacing, the bottom caliper bolt needed two M6 washers to scoot the caliper out a bit so the rotor would line up correctly. This install takes some finessing and a good measure of cussing but the end result is worth the effort. I opted to run the twin systems from two separate battery packs for redundancy. In the event that I break a chain, I can always scoot back under front hub power and on long level trips the second battery gives me a total of up to 100 miles of cruising distance on a single charge.
Below are some photos from my ride.