My Oxygen S-Cross MTB motor cuts out at 20mph, I've read on this Forum that after the 'Secret code' has been entered they top out at about 26mph. Mine has the Code entered. Clare 
Help, please with my Oxygen...
- Thread starter Clare the Rear
- Start date
Hi Clare,
26mph may be a bit optimistic.
Lift the rear wheel and spin the cranks by hand.
What speed do you see?
That is the noload speed of your bike.
Unless you are a very strong pedaller, you won't achieve as much as that on the road.
26mph may be a bit optimistic.
Lift the rear wheel and spin the cranks by hand.
What speed do you see?
That is the noload speed of your bike.
Unless you are a very strong pedaller, you won't achieve as much as that on the road.
D
Deleted member 4366
Guest
26 mph is achievable, but you need to pedal a bit too. After you put in the code, you select your own speed limit. What did you set it to? Bear in mind that you set the speed limit separately for the throttle and pedal sensor, so you need to enter two speed limits for both to work without restriction.
You need to set the wheel diamater correctly. I suspect that you've set it smaller, in which case the speed is faster than what shoes on the display.
You need to set the wheel diamater correctly. I suspect that you've set it smaller, in which case the speed is faster than what shoes on the display.
Last edited by a moderator:
I do realize that the user input tops up the motor power but even my fastest ever bike, the Krieger with 20A controller, could not hold on to 26mph for long when derestricted. The battery consumption rockets upward as soon as you go over 20mph.
My Rio MTB, with 17A controller, can only hold on to about 22mph for an average rider.
Hi d8veh, After the code was entered it came up with 68mph! on both so that chosen. The wheel size is set on 28" but i can only get about 20mph & that's pedelling hard. Clare
Hi Clare,
there is no more you can do.
The speed limiter cuts the power to the motor to stay legal but it does not reduce the motor's power.
there is no more you can do.
The speed limiter cuts the power to the motor to stay legal but it does not reduce the motor's power.
That (32 km/h) was about the top speed of my hub motor bike no matter what I set the speed limit to. That same motor exists in a 42 km/h version with a 17 Amp controller.My Oxygen S-Cross MTB motor cuts out at 20mph, I've read on this Forum that after the 'Secret code' has been entered they top out at about 26mph. Mine has the Code entered. Clare
Maybe this is the issue you are seeing? You may be at the top speed for the motor mounted on your bike?
D
Deleted member 4366
Guest
Hmmmm! That's weird. I've derestricted a few, and anybody could do 24 mph without much effort. Let's take a couple of steps back. Firstly, don't confuse things by adjusting the wheel size. It should work on 700c/28". Did you definitely save the setting? It should show 68 mph now as soon as you give the code if you saved it properly. Lift the bike up and spin the wheels to see that they spin freely.Hi d8veh, After the code was entered it came up with 68mph! on both so that chosen. The wheel size is set on 28" but i can only get about 20mph & that's pedelling hard. Clare
I think I know the answer. It's just come to me. The PAS levels on the LCD are speed controls. You have to be on level 6 to get maximum speed, and you need to be in sport mode to get maximum power. 20 mph is the speed limit for level 5, and you wouldn't have enough power to get past 20 mph if you were on eco or the middle power mode.
Please let us know when you can get 28 mph to put the naysayers to bed.
I have an Oxygen E-Mate CB. It's the 2015 model that was replaced in early 2016.Hi d8veh, After the code was entered it came up with 68mph! on both so that chosen. The wheel size is set on 28" but i can only get about 20mph & that's pedelling hard. Clare
The LCD has 5 speed/power modes, plus zero.
On the throttle it will do about 19mph.
On pedal assist no more than 15mph.
Can anyone advise me with this "code", please?
what is the point of measuring the noload speed on PAS? The result would vary with how fast you rotate the cranks by hands.
D
Deleted member 4366
Guest
I hope your Wooshbikes aren't like that. It would be diabolical!. Every time you changed up a gear to go faster, you'd lose assistance and slow back down again.
I don't get you.
I can see the point of measuring the noload speed using the throttle, it will return the noload speed of the motor, independent of the tester.
If you ride the bike or spin the cranks by hand, the result is no longer independent of the tester.
The reason Clare could not get to your speed is because your legs are stronger than hers.
D
Deleted member 4366
Guest
We don't know why Clare can't go any faster because she hasn't given us the no-load speeds yet.
Turning the pedals in first gear with the wheel off the ground and level 6 selected will give the motors maximum speed with the PAS, which is controlled independently of the throttles max speed.
Turning the pedals in first gear with the wheel off the ground and level 6 selected will give the motors maximum speed with the PAS, which is controlled independently of the throttles max speed.
she did so in this recent post:
It is at 70%-75% of the noload speed test.
For a hub motored commuter bike, the target speed is 15.5mph, where you want the motor to be most efficient and deliver most torque. The ideal noload speed is thus 21 mph. Crank drive motors are more flexible.
For those who are not familiar with noload speed test, the test is important for designers to work out where the sweet zone is for that motor.
It is at 70%-75% of the noload speed test.
For a hub motored commuter bike, the target speed is 15.5mph, where you want the motor to be most efficient and deliver most torque. The ideal noload speed is thus 21 mph. Crank drive motors are more flexible.
As an aside - is there a standard 'sweet zone' for s-pedelecs?
The max speed is then 28mph, however I imagine that might not actually be where you would want the most efficient delivery ?
one important design goals is to minimize battery consumption.
you want the motor to be most efficient where you expect your customers to ride most of his/her miles at (speed-wise).
The sweetzone is only important for geared hub bikes because their useful 'bandwidth' is much smaller than that of a crank drive or a direct drive motor so it needs to be well chosen.
If I build an s-pedelec, the sweetzone will be 28mph. If it has to be a geared hub, I would run my Rio 7 MTB at 48V 20A, that will give me 350RPM on 27.5" tyres.
by the way, if you like high noload speed, all CD bikes will go off scale, more than 28mph if you derestrict them, including my Krieger, Bali and Santana CD.