Rad Power Bikes Owners Forum

Rad Power Bikes Chat => Service & Repair => Topic started by: Bellbd on December 08, 2023, 01:41:34 PM

Title: 2017 radcity pedal assist disc
Post by: Bellbd on December 08, 2023, 01:41:34 PM
I have a 2017 Radcity the pedal assist disc broke and rad does not carry the 6magnet discs anymore, does anyone know where to find a 6 magnet replacement disc for this model?
Title: Re: 2017 radcity pedal assist disc
Post by: handlebar on December 08, 2023, 06:01:26 PM
https://amzn.to/3HrwLkT
https://amzn.to/3Ho4ATQ

These have 6 magnets, but I don't know if either would work.
Title: Re: 2017 radcity pedal assist disc
Post by: Bellbd on December 08, 2023, 06:32:17 PM
I was hoping to just get the disc
Title: Re: 2017 radcity pedal assist disc
Post by: handlebar on December 08, 2023, 07:29:39 PM
It's too bad Radpower won't at least point you to a source. I had the same problem when three of their spokes broke. I asked where to get replacements and they ignored me.
Title: Re: 2017 radcity pedal assist disc
Post by: Bellbd on December 09, 2023, 01:11:03 AM
I am sorry; yeah they told me to go to a forum. I found this but not sure if the magnets are spaced right https://cart.electricscooterparts.com/pedal-assist-sensor-with-six-magnet-ring
Title: Re: 2017 radcity pedal assist disc
Post by: John Rose on December 09, 2023, 11:30:06 AM
Quote from: Bellbd on December 09, 2023, 01:11:03 AM
I am sorry; yeah they told me to go to a forum. I found this but not sure if the magnets are spaced right https://cart.electricscooterparts.com/pedal-assist-sensor-with-six-magnet-ring
That one looks like you could move, add, or subtract magnets to get 4, 6, or 8 evenly-spaced magnets. I can't figure out any other combinations.
If you need more magnets: There is a computer & table-top gaming store near me that sells neodymium magnet disks as big as 20 mm or so, and as small as something like 2 mm diameter. They're used to make small models and figures with interchangeable/moveable parts.

As an afterthought - do the speedometers/odometers use the cadence sensor to derive the speed and distance? If that's the case, then the number of magnets is probably important.
Title: Re: 2017 radcity pedal assist disc
Post by: handlebar on December 09, 2023, 12:01:27 PM
Quote from: John Rose on December 09, 2023, 11:30:06 AM

As an afterthought - do the speedometers/odometers use the cadence sensor to derive the speed and distance? If that's the case, then the number of magnets is probably important.

The speedometer sensor magnet can be on a spoke but on rad bikes is in a part of the motor assembly that turns whenever the wheel turns.

AFAIK, the cadence sensor just tells the controller when you are pedaling. I wonder why the number of magnets matters.
Title: Re: 2017 radcity pedal assist disc
Post by: Bellbd on December 09, 2023, 01:22:30 PM
Thanks I had no idea what the answer was for that, just the reading I have done is that the spacing seemed to matter
Title: Re: 2017 radcity pedal assist disc
Post by: John Rose on December 09, 2023, 07:31:58 PM
Quote from: handlebar on December 09, 2023, 12:01:27 PM
Quote from: John Rose on December 09, 2023, 11:30:06 AM

As an afterthought - do the speedometers/odometers use the cadence sensor to derive the speed and distance? If that's the case, then the number of magnets is probably important.

The speedometer sensor magnet can be on a spoke but on rad bikes is in a part of the motor assembly that turns whenever the wheel turns.

AFAIK, the cadence sensor just tells the controller when you are pedaling. I wonder why the number of magnets matters.
*facepalm*
Of course, what was I thinking.  :-[ If you stop pedalling and coast or use the throttle, it still shows up as speed and distance.