Speed Governor

Geno929

Member
On the Rad display, you can hold the up/down buttons together, then access the menu to change wheel size and increase max. kph from 32 to 40 kph. This will allow the Rad to give PAS up to 25 mph = 40 kph. That's about all you can do on a stock Rad.
 

ExPatBrit

Active Member
On the Rad display, you can hold the up/down buttons together, then access the menu to change wheel size and increase max. kph from 32 to 40 kph. This will allow the Rad to give PAS up to 25 mph = 40 kph. That's about all you can do on a stock Rad.
Doesn,t work on 2020 bikes, you can set it but it has no effect.
 

Geno929

Member
Doesn,t work on 2020 bikes, you can set it but it has no effect.
Uh, it works fine on my two 2020 Rad City & 2020 Rad Rover bikes. My bike will give PAS right up to 24.8 mph, then will restrict speed. And when I put it into PAS 0 or 1, I can pedal over 24.8 mph and get speed up to 27 - 28 mph.
 

Wolfsfriend42

New Member
On the Rad display, you can hold the up/down buttons together, then access the menu to change wheel size and increase max. kph from 32 to 40 kph. This will allow the Rad to give PAS up to 25 mph = 40 kph. That's about all you can do on a stock Rad.
hmm, this does nothing at all. I need to be able to turn it off altogether and also be able to turn it back on.
 

ExPatBrit

Active Member
Uh, it works fine on my two 2020 Rad City & 2020 Rad Rover bikes. My bike will give PAS right up to 24.8 mph, then will restrict speed. And when I put it into PAS 0 or 1, I can pedal over 24.8 mph and get speed up to 27 - 28 mph.
Rumor has it, that it has been disabled on some recent Rad Bikes. There have been several posts on it here.

Presumably for liability issues related to top speed on class 2 e-bikes.
 
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Geno929

Member
Does anyone know how to turn the speed governor off and back on, on a Rad Wagon purchased this year?
On my ride into work today, I turned PAS to 0 and did 28.6 mph down a long hill, pedaling as fast as I could. I reached the bottom of the hill, kept pedaling and went to PAS 2 / 3 up the other side of the hill. Hopefully this helps. At 24.7 mph in PAS 1 - 5 the motor will try to restrict speed.
 

ExPatBrit

Active Member
On my ride into work today, I turned PAS to 0 and did 28.6 mph down a long hill, pedaling as fast as I could. I reached the bottom of the hill, kept pedaling and went to PAS 2 / 3 up the other side of the hill. Hopefully this helps. At 24.7 mph in PAS 1 - 5 the motor will try to restrict speed.
That's what I would do prior to installing the Bolton Kit. The kit allows me to go to about 40 mph downhill with a larger chain ring.
 

Timpo

Well-Known Member
That's what I would do prior to installing the Bolton Kit. The kit allows me to go to about 40 mph downhill with a larger chain ring.
Electro Bike World started selling Hailong 52V 17.5Ah battery for Rad Power bikes.
I prefer than than Bolton 52V 20Ah with triagle bag... it looks much cleaner and closer to stock.
 

ExPatBrit

Active Member
Electro Bike World started selling Hailong 52V 17.5Ah battery for Rad Power bikes.
I prefer than than Bolton 52V 20Ah with triagle bag... it looks much cleaner and closer to stock.
I think the Bolton bag is fugly.

If you get a higher voltage battery, you get more speed but doesn't add much range as it also raises the corresponding minimum cut off voltage.

Instead of 42-54 volts (for a 48 volt battery) you will be 46-58 volts, you will have more power when the battery is low.

My Rover is fast enough, would prefer more Ah and more range, 20Ah at 48 volt would be good. 10 miles additional range?
 
Rumor has it, that it has been disabled on some recent Rad Bikes. There have been several posts on it here.

Presumably for liability issues related to top speed on class 2 e-bikes.
Wondering if you (or anyone else on this forum) has since been able to confirm (or disconfirm) this rumor? It seems to be true, as I set the display on my 2020 RR+ to 40 kph yet with no measurable effect. I also tried a reported hack for my 2020 RR1 by taping over the motor cable pin that (again reportedly) limits the speed on this bike -- again no effect. However if RPB has indeed disabled the speed limit hack on some/many/all of their 2020 bikes, you'd think there would be more folks out there reporting this. Yet this is the only forum of which I am aware that so much as even mentions this rumor. Can you please tell me where you have read/heard this???
 

EBJ

Member
...Can you please tell me where you have read/heard this???
Probably from multiple people like us who have reported here and elsewhere that the top speed hack no longer appears to work with Rads delivered from roughly June 2020 on.

Attempting to cheat by entering a bogus wheel size will cause the odometer/speedometer readouts to change (reporting gross errors), but the actual top speed cutoff remains the same, as verified by my highly accurate Garmin handheld GPS units.

Easily understandable, the fixed electronic revolution counter circuitry in the rear wheel must feed two logic branches, one to the odometer/speedometer display calculation registers (which the user can diddle with), and the other branch to the top speed limiter circuit in the Rad OEM controller, which is apparently now hard programmed as it is being installed into a specific bike at the factory (depending on wheel size), using a proprietary device that connects to the rectangular mystery plug with the rubber cover connected to the controller. IF this is true, swapping as delivered Rad OEM controllers between ~post-June 2020 Rad bikes with 20, 24 and 26 inch wheels SHOULD affect the top speed.
 
Probably from multiple people like us who have reported here and elsewhere that the top speed hack no longer appears to work with Rads delivered from roughly June 2020 on.

Attempting to cheat by entering a bogus wheel size will cause the odometer/speedometer readouts to change (reporting gross errors), but the actual top speed cutoff remains the same, as verified by my highly accurate Garmin handheld GPS units.

Easily understandable, the fixed electronic revolution counter circuitry in the rear wheel must feed two logic branches, one to the odometer/speedometer display calculation registers (which the user can diddle with), and the other branch to the top speed limiter circuit in the Rad OEM controller, which is apparently now hard programmed as it is being installed into a specific bike at the factory (depending on wheel size), using a proprietary device that connects to the rectangular mystery plug with the rubber cover connected to the controller. IF this is true, swapping as delivered Rad OEM controllers between ~post-June 2020 Rad bikes with 20, 24 and 26 inch wheels SHOULD affect the top speed.
Thanks for the clarification; most detailed explanation I have seen (though I am not on FB, if this is where all/most of the discussion on this topic has occurred). Btw, my RR1 shipped in mid May. So it seems that the new speed restriction may have been implemented a bit earlier than you suggest.

It strikes me as at least possible, in principle, that the new restriction is hard-coded through the display, and not necessarily the controller. If so, then it would also seem possible to use a device like EggRider to reprogram the controller (unless the restriction is implemented in hardware, not firmware). But either way, if the limit is now fixed within the controller, as you suggest, then a controller & display mod from Bolton or EBW would obviously eliminate this restriction. I don't know if it's even possible to set the limit in the motor itself, but this seems unlikely as it would probably require a costly mod from Bafang (though given that Bafang is already supplying proprietary motors to RPB, maybe not...).

I'm just thankful that I am not among the poor saps who shelled out $99 to RPB for an outdated monochrome display thinking this would allow them to override the speed restriction -- I'll bet RPB made a small fortune over the past few months on unwitting customers who purchased that display for precisely this reason.
 

EBJ

Member
... my RR1 shipped in mid May. So it seems that the new speed restriction may have been implemented a bit earlier than you suggest.
I suspect the change cut-in may have occurred over a span of several months for the different models. I'm not on FB either so my exposure is also limited.
It strikes me as at least possible, in principle, that the new restriction is hard-coded through the display, and not necessarily the controller.
I suspected the controller as the thing being programmed largely because it has that suspicious "extra" connector. I worked in manufacturing for years and can appreciate the simplicity of stocking only a single part number for an item (rather than a different pre-programmed part for each distinct bike model), and then flashing specifics as it is installed. I wonder if Rad OEM replacement controllers now come pre-programmed for the customers specific bike, or whether they might be the older/generic type with a 40 km/h diddleable top cutout, hmm...

I went down on wet leaves the other day (thanlfully not on the Rad), so it's probably best for me to stay well south of 20 MPH for a while anyway.
 
I suspected the controller as the thing being programmed largely because it has that suspicious "extra" connector.
Now you've really piqued my curiosity -- I have no idea what is this "suspicious" rectangular "mystery plug" to which you refer??? If the controller itself has new cabling, then one suspects that even the Bolton/EBW mod may not work anymore...
 

Timpo

Well-Known Member
I think the Bolton bag is fugly.

If you get a higher voltage battery, you get more speed but doesn't add much range as it also raises the corresponding minimum cut off voltage.

Instead of 42-54 volts (for a 48 volt battery) you will be 46-58 volts, you will have more power when the battery is low.

My Rover is fast enough, would prefer more Ah and more range, 20Ah at 48 volt would be good. 10 miles additional range?
Will EM3EV pack work?

Because I don't see why not, if Electro Bike World pack works..
 

EBJ

Member
...I have no idea what is this "suspicious" rectangular "mystery plug" to which you refer???...

On my June 2020 shipped 2020 RadMini 4 it's in the rats nest bundle of wires tie wrapped underneath the bottom bracket (it may be in a slightly different place on other models). It's on the end of one of the shorter wires (5 of them if I remember correctly) coming directly out of the controller, and it has four open female connectors underneath its tethered rubber cap.
 
On my June 2020 shipped 2020 RadMini 4 it's in the rats nest bundle of wires tie wrapped underneath the bottom bracket (it may be in a slightly different place on other models). It's on the end of one of the shorter wires (5 of them if I remember correctly) coming directly out of the controller, and it has four open female connectors underneath its tethered rubber cap.
Hmm... I am (obviously) not intimately familiar with the Rad controllers -- never had a reason (yet) to dig into this in any great detail. But I notice that the Bolton controller also has five cables, including (as I understand) a new one for the tail light, whereas the EBW controller appears to have just four.
Would be great if others would pipe-in here to help sort out the confusion...