500w, Dayton 24V DC Gear Motor MY1020 setup

[fabieville]

My 24v e-bike needs a replacement motor. I was using a 24v 350watt my1016z3 geared motor and now the amature has failed and the brushes rub down so I am planning to buy a next motor. I was looking at this motor a MY1020Z Dayton 500w, (0.67 HP) 24V DC Planetary Gear Motor, 500 RPM. Would this be a big upgrade from the 24v 350watt unite that I had before. What would be the est. max top speed on a flat terrain using a 24v 30ah lithium Li-ion battery with a 160 lbs ride?

Also i need a freewheel with freewheel adapter for it. Where can I get one to fit the output shaft?
Here are the specs for the motor:

Our highest power 24V hobbyist gear motor packing an awesome 500 Watts of power!
This Dayton sports a planetary gearbox rather than a spur gear. The advantage is that when compared to the united gear motors (which use a spur gearbox), is that the planetary style gearbox is not only much stronger, it's also much quieter at high torque and high speed!

These have been a popular replacement for motorson golf carts, ATV's, Kids quads farm vehicles and more!
Extremely popular choice for any project requiring decent torque and speed. Easily reversible by reversing polarity to the motor!
Specifications:
Permanent Magnet DC Motor
Voltage: 24 Volt
No Load RPM: 3000
No Load Current: <2.8 Amps
Rated Wattage: 500W (0.67 Horsepower)
Rated Load RPM: 2650
500 RPM output from gearbox
Torque (Nm): 8.5
Rated Current: 26.7 Amps
Efficiency: 78%
Reduction Ratio: 6.67:1
Direct Drive (No Free Spooling)
Suitable for Forward and Reverse Operation
Base Mount Model
12 Gauge Power wire

 

[slowhands]

I assume you are in Australia, since you mention a motor that seems to be available only there.
http://www.ejwinter.com.au/dayton-500w,-0.67-hp-24v-dc-planetary-gear-motor,-500-rpm-p465/
https://www.motiondynamics.com.au/dayton-500w-0.67-hp-24v-dc-planetary-500rpm.html

This is another brushed motor, which will have a short life like your last one. It is nice, but nothing special. Is this used to drive a side mounted motor on the rear wheel? If you are just looking to repair your existing bike with minimal changes, get a motor similar to what you had. Otherwise you are inventing a new bike with many of the problems of your old bike.

Most people are using 3 phase AC motors on bikes now. These have many advantages, especially higher reliability and efficiency. Most bikes today use a hub motor, in the hub of the rear wheel or front wheel. These are probably a better solution for a new design or upgrade.

You can get small ones for under $100 that run on 24v, so you could use your batteries if you wanted to. Here is a good small one for the rear wheel:
https://bmsbattery.com/ebike-kit/425-q100-24v250w-350w-rear-e-bike-kit-with-led-meter-ebike-kit.html
https://bmsbattery.com/ebike-kit/354-q100-24v250w-350w-rear-driving-ebike-hub-motor-ebike-kit.html

This rear hub motor actually has a compound planetary gear built in, giving a 12.5 reduction, which means the motor can work very efficiently to give you good torque, among other things. You need to buy a throttle and compatible controller for this motor, but they are cheap in the kit listed above.