I wanted to design and build the ultimate commuter ebikes: highest quality parts, reliability, fattest production tires, the most powerful motor available and plenty of gears in an e-bike that looks like a regular bicycle.
Here is a picture of the two prototypes that I built:
I tested those prototypes a lot for a year, and I found many areas in which the bike could be improved.
I finished building the improved models, and here are the specifications:
-Design Logic fat tire cargo frame (190mm dropouts, 44mm head tube)
-Zelena Vozila Cromotor with custom wide axles (268mm axle length, 190mm dropouts)
-Vee Tire Snowshoe 2XL tires (31.5" X 5.05")
-Surly Clownshoe rim in front, Rolling Darryl in rear
-Lyen Mark 2 10kW 4110 controller set to maximum phase and battery current, optimized for 72V, maximum regenerative braking and 3 speed switch set to 33/66/99
-Electric Rider 20Ah 72V LiMn battery with 100A BMS
-Surly Ice Cream Truck fork with 150mm through axle
-Tektro Dorado HD-E710 hydraulic disc brakes with 203mm rotors front and rear
-Topeak Drybag panniers and trunk bag
-Grin Tech Cycle Analyst V3 with motor temperature sensor
-Surly Mr. Whirly crankset with 58T chainring and 14-28 5-speed freewheel
-Extreme tire liners
Click on a thumbnail to view picture:
I can be contacted at firstname.lastname@example.org. My name is Erik M.
After finishing the two production models, I upgraded the prototypes to the improved specifications: Cromotors, hydraulic brakes with 203mm rotors, fixed stems, thicker grips and improved torque plates.
Pulling the Crystalyte motors out of the prototypes left me with two extra rims. I had two extra Cromotors and I laced those into the extra rims so I now have a spare 170mm dropout wheel as well as a spare 190mm dropout wheel in case I fry a motor or break an axle.