@Jim Cook EMTB is not available as an option in a Class 3 Performance speed motor. It is only available in a CX motor and its primary design intent is for mountain or off road trail riding.
Personally I prefer Sport over EMTB as it leave more control over electron expenditure in the hands of the rider.
The rational behind the creation of the EMTB option is that it frees up the attention and the left hands of a mountain bike rider in varying, technical riding conditions to keep both hands more firmly on the handlebars requiring only shift selection with the right hand and eliminating or, more accurately, automating the assist mode selection for the rider.
With the 4 extra custom ride modes unlocked on my Nyon display, I can have the best of both worlds.
AND, I can customize the assistance to suit my particular bike, gear train, fitness level, and local terrain.
It was only $5.49 to unlock the extra modes,
and it will allow me to experiment with different profiles to dial in the behavior of the motor to what I want,
rather than what Bosch has decided is best for the masses.
In my playing around with the custom modes so far I have found:
- Node "a" on each curve is locked at zero speed, but can be adjusted to any assist percentage.
- You can adjust nodes "b"-thru-"e" on each curve to different speeds in one MPH increments.
- Nodes "a"-thru-"d" on each curve can be adjusted up and down the scale however you wish, including overlapping other curves.
- The final node "e" can be adjusted to any speed greater than node "d" but is locked at an assist level of 0% which cuts out the motor above that speed.
- The farthest you can move any node on each curve appears to be +/-1mph in relation to the node next to it.
That still allows quite a bit of room to play around, and I intend to do so over time just for fun and educational purposes.
You can create some pretty wild curves!
As you can see, you can set the motor cut-off speed to be as low as 2mph.
I do not know
why you might want to create a power mode curve like the above screenshot, but you can...
It may be that for the Speed motor owners, showing a park ranger your custom mode screen set to cut off at 20mph might let you talk your way out of a ticket?
(For entertainment purposes only, consult your own counsel, professional rider on a closed course, do not attempt, YMMV.)
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I have attached screen shots showing the curves I have come up with as starting points for my custom modes.
To start off:
- For Mode-1: I am going to have a curve which ramps up with speed for riding on mostly level terrain.
(more assist to help overcome increasing aerodynamic drag)
- For Mode-2: I am going with a curve which which tapers off at higher speeds in hilly terrain.
(more assist as you slow down heading uphill, less assist as gravity assists going down the backside).
- For Modes 3 & 4: I am going to keep flat power levels for mode 3 & 4. (255% & 340% respectively)
(but with Mode-3 set at a slightly higher percentage than the 240% that is offered in Sport Mode with the Gen-4 Performance Line motors.)
Time will tell...