EVO Cross Pro surges on one pedal stroke

Palefountain

New Member
I have a 2017 Emotion EVO cross pro (EU version) the one with the central control panel. I am having a problem with the
bike as it keeps surging forward when you try to keep a steady pedalling cadence? Especially in 30% & 50%. It seems like on one pedal stroke it surges (assistance kicks in) and the next pedal stroke nothing (Irrespective of which gear I am in). Even though I am pedalling very steadily and am below 25 Kmh (The cutoff speed) . 70 & 100% assist seem fine.

Any ideas on solving this?

Regards

John
 

MisterM

Active Member
I have a 2017 Emotion EVO cross pro (EU version) the one with the central control panel. I am having a problem with the
bike as it keeps surging forward when you try to keep a steady pedalling cadence? Especially in 30% & 50%. It seems like on one pedal stroke it surges (assistance kicks in) and the next pedal stroke nothing (Irrespective of which gear I am in). Even though I am pedalling very steadily and am below 25 Kmh (The cutoff speed) . 70 & 100% assist seem fine.

Any ideas on solving this?

Regards

John
Check your cadence sensor - if it's knocked out of alignment, it will only engage part of the pedal stroke.
 

Ravi Kempaiah

Well-Known Member
I have a 2017 Emotion EVO cross pro (EU version) the one with the central control panel. I am having a problem with the
bike as it keeps surging forward when you try to keep a steady pedalling cadence? Especially in 30% & 50%. It seems like on one pedal stroke it surges (assistance kicks in) and the next pedal stroke nothing (Irrespective of which gear I am in). Even though I am pedalling very steadily and am below 25 Kmh (The cutoff speed) . 70 & 100% assist seem fine.

Any ideas on solving this?

Regards

John
The torque sensor might be off. Take it back to the dealer and ask them to tune it.
Also, if you find the right gear (sweet spot) and cadence, you could entirely eliminate the surging behavior.
 

Palefountain

New Member
Thanks very much for the quick replies. "Mister M" I couldn't find anything that looked like a cadence sensor, not that I know what one looks like! I was looking around the bottom bracket, chainwheel, pedal area.

"Ravi" I think I will go back to the dealer and ask about tuning the Torque sensor. You're right about the sweet spot as I can find it at 75%, it's just 30% & 50% where there is a problem.

Cheers

John
 

Portland

New Member
I had the same problem with my Evo City bike; the pedaling was very "surgy", giving the pedaling a jerky, uneven feel, despite pedaling as smoothly and steadily as I could. The dealer had to reprogram the cadence sensor sensitivity, and it took a few attempts to get it adjusted, but it is now tuned up nicely. Trying the bike between adjustments, I think there is a fine balance between too-sensitive (jerky) and not sensitive enough (sluggish feeling). (I don't think the consumer can do this as it takes specialized software).
 

Palefountain

New Member
I had the same problem with my Evo City bike; the pedaling was very "surgy", giving the pedaling a jerky, uneven feel, despite pedaling as smoothly and steadily as I could. The dealer had to reprogram the cadence sensor sensitivity, and it took a few attempts to get it adjusted, but it is now tuned up nicely. Trying the bike between adjustments, I think there is a fine balance between too-sensitive (jerky) and not sensitive enough (sluggish feeling). (I don't think the consumer can do this as it takes specialized software).
Thanks for the reply Portland I was beginning to think it was just me. What you describe is exactly the problem I am having. I have been back to the dealer, but he didn't think there was a problem (although he is a young mountain biker so he probably hammered off at 15mph(max assist in UK) and didn't notice any surges). I will visit again and get him to take another look.

Cheers

John
 

PowerMe

Well-Known Member
I find on my Evo Street I need to (and want to) shift gears to the higher ones that are harder, in order to have what feels like optimum pedaling. This is especially true when I increase the assistance levels. Honestly, I don't pay a lot of attention to my cadence per se, I mean I couldn't tell you what cadence I'm pedaling, I just go by how I feel and if I'm feeling fatigue at a certain gear level. It's not like the pedaling I see the lycra guys do, I'm slower. I feel like I put more 'torque' into my pedaling, which is a slower cadence, and those higher gears feel better to me. Does that even make sense? (Obviously, though, if I encounter a hill then I downshift my gears).