davidsvoboda said:
so I won't do wrong if I go with this one- http://www.elifebike.com/peng/iview.asp?KeyID=dtpic-2012-8A-RK1S.8TKFU
I would like it to be fairly lightweight too - maximum 3 kilos. And - do you I just order a controller for 48V 750W motor and run it with it and that's gonna do the trick?
Thank you!
That motor has a wider dimension than the standard 135mm at 144mm plus it's a 1 speed. Is that what you want?
What size wheel are you using and what is your desired unassisted top speed? Once you answer those questions you can determine the rpm of the motor you will need. Getting the motor that spins at the desired RPM/V can be difficult as most vendors don't seem to understand the concept. Usually the RPM they quote is for a nominal 36V...but not always.
I really like my 8 RPM/V YOUE 250W motor for its combination of torque, speed (27 mph 12S LiPo 700Cx40mm) and serviceability.
http://www.aliexpress.com/item/36V-48V-250W-High-Speed-Brushless-Gear-Hub-Motor-E-bike-Motor-Rear-Wheel-Drive-YOUE/1888938628.html
I've also enjoyed the 2 (front) MXUS geared motors I've owned. The 6.6 RPM/V model was a little brute while the 8.9 RPM/V model was fast (29 mph on 12S LiPo/700Cx40mm) but lacked low-end torque. I would love to find one somewhere in the middle.
http://www.aliexpress.com/item/36V-48V-250W-High-Speed-Brushless-Gear-Hub-Motor-E-bike-Motor-Front-Wheel-Drive-MXUS/1880894600.html
http://www.aliexpress.com/item/36V-48V-250W-High-Speed-Brushless-Gear-Hub-Cassette-Motor-E-bike-Cassette-Motor-Rear-Wheel/1888675185.html
You really can't go wrong with a Bafang, either the front SWXK5 or rear SWXH though they generally only come in a slow wound version. I don't know anyone who has tried their latest smaller SWXU model.
The Cute Q100H is generally the go-to motor for those who want the smallest motor that can still handle some power. I've only used the regular 201 RPM Q100 (actual 6.4RPM/V) so I can't comment on the H's performance. The standard Q100 isn't particularly strong but I did appreciate the ability to use a 160mm disc with a conventional alternating lacing pattern and its smooth operation. The 260 RPM Q100H does provide decent speed in a 26" or 700C wheel when used at 48V.
Yes there are lots of choices but as I said you can narrow it down by determining the parameters that are important to you;
wheel size used
speed desired
front or rear application
freewheel or cassette
disc compatibility
serviceability
-R