Time for yet another motor change for my Raleigh test mule. First there was the 36V Bafang QSWXB which migrated to my Kona Smoke, then came a Nine Continent 9x7 motor, a real hoot at 48V but too big, and now a 24V Golden Motor mini-motorÃ¢â‚¬Â¦well, just because.
I ordered the mini-motor from Golden Motor for $139 and 9 days later it was delivered but was damaged and unusable. I contacted the folks at Golden Motor and was promised a replacement. Two weeks later and I found out they never shipped it but promised to do so right away and true to their word less than a week later (yesterday) the new motor arrived. (Thank you Mr. Yao Yuan and 'Tom'
This Ã¢â‚¬Å“mini-motorÃ¢â‚¬Â truly is small measuring about 1cm smaller in diameter than my Bafang and weighing in at 5 lb 12 oz
(2.6 Kg) compared to my Bafang at 7 lb 2 oz (3.2 Kg). The motor is also disc capable. Dimensionally and appearance-wise it sure looks like a Bafang QSWXH, and thatÃ¢â‚¬â„¢s not a bad thing.
I removed the 9C motor from the Sun CR18 rim and laced up the Mini using 258mm Wheelsmith DH-13 spokes with 16mm nipples in a 2X configuration.
I ran into just one problem; the Mini was too narrow for the forks which is odd since the Bafang and 9C fit snugly into the same opening. I moved one of the thick anti-spin washers to the inside and that fixed that.
I used two of the 9CÃ¢â‚¬â„¢s mini torque arms to help secure the mini-motor.
After that I lopped off the phase wire bullet connectors and installed Andersons to mate with the little 36V/15A 6 FET controller that originally came with my Bafang motor (that motor now runs on an E-BikeKit 9 FET controller at 48V). The little motor spun up right away with a promising no-load speed of 30.1 mph at 41.0V powered by my 36V/6Ah Bosch Fatpack 3-pack.
Today I took out the GM mini-motor for the first time. The low end grunt is meager, far less than the 36V Bafang at 48V and perhaps even less than the Bafang at a stock 36V, itÃ¢â‚¬â„¢s hard to remember now how it felt. Acceleration on the motor alone is weak at any time making this a true Ã¢â‚¬Å“assist onlyÃ¢â‚¬Â set-up. The trade off for this weak low end performance is speed and in that department this 24V Mini is much faster at 36V than the 36V Bafang on a 36V pack. On this bike with 700x35 tires the Bafang topped out in the low 17Ã¢â‚¬â„¢s while the top speed of the 24V Mini at 36V is in the vicinity of 22-24 mph. After one ride I canÃ¢â‚¬â„¢t pinpoint the top speed any closer since level ground and no wind conditions are hard to come by plus I believe the 15A controller is a limitation here. At top speed the controller is pretty much maxed out so any undulation or wind impacts the speed more than usual. I have another 22A controller I can use in the future to check this out. The last 4 miles of the ride today I held full throttle much of the time and the motor barely got warm...promising.