Well, I have decided to move forward with testing a MY1018 450W 36V custom mid-drive setup on this frame prior to moving it to my full suspension MTB. I picked up an all aluminum housing MY1018 / YK31C controller and have an under bar left side thumb throttle that I might try on the right side as a finger pull throttle. This motor should be close to only 4.5lbs.
I hope to combine those two items with a freewheel crank and freewheel sprocket on the motor itself. This should provide the absolute minimum drag possible while pedalling without power, allow back pedalling and allow throttle while coasting (not pedalling).
The motor will be mounted within the frame triangle with brackets from the BB attached to one of the two bottle mounts for torque support. Eventually I will do some calculations for the best light wieght small capacity battery for this hill climb only application.
This kit is very similar to what the end result will look like, but the motor will be an all aluminum one without that heavy flat metal bracket and housing; and not mounted under the frame triangle, but within it.
Here are the motor and controller stated specifications:
MY1018 - 24V 450W GEAR REDUCTION “BRUSH” MOTOR
(Came with rear stay mounting bracket, sprocket, chain, nuts & bolts)
Specs:
- 24 Volt, 25A Rated Load, 2.5A No Load
- 1.43Nm at the output sprocket @440 RPM
- 12 gauge power leads
- Reduction Ratio: 9.78:1
- 9 tooth sprocket for 1/2'' x 1/8'' pitch standard bike chain
- Direct Drive (No Free Spooling)
- Alloy case for good heat dispersion.
- Bicycle style mounting bracket Included. (Suits the 250w and 450w models)
- Suitable for Forward and Reverse Operations
- Weight: 2.2KG / 4.85LB (alloy motor and frame!)
YIYUN TECH - YK31C
(Brush motor controller for electric bicycle & scooter)
Rated voltage: DC 36V
Current limit: 28A
Rated power: 500W
Matching motor: DC brushed motor
Under Voltage Protection: 31.5V
Wire Interface Definitions
Battery: Thick Black (Power Negative) / Thick Red (Power Positive)
Motor: Thick Yellow (Motor Negative) / Thick Blue (Motor Positive)
Ignition Switch: Thin Red (VCC) / Thin Blue
Indicator: Thin Red (Indicator power output) / Thin black (Indicator Negative)
Brake: Thin Yellow (Brake signal) / Thin Black (Negative Power)
Speed governor: Thin Blue (Speed handlebar Signal input) / Thin Black (Negative Power) / Thin Red (5V Positive Power)
Charge Port: Thin Red (charge input power Positive) / Thin Black (Power Negative)
Brake Light: Thin Red (power Positive) / Thin Black (Power negative)