The noise generated in that video is 100% going to appear on all motors to some degree, that is simply backlash in the gear sets which cannot be removed without removing all tolerances from the gears and having a gearset which wont turn. The reason some people hear it after a few rides is the grease gets distributed and no doubt when the motor warms up the tolerances increase to some extent. You are totally wasting your time chasing that backlash sound, even if you get a new motor that will do it also after a time. It is 10x quieter than the M1 and the m2 doesn't do it on every bump, but its not a fault - would be nice if it was totally 100% silent but not possible to remove all backlash with that design.
Avinox M2s rattle
- Thread starter Rob209
- Start date
Yeah but mine is doing it on every bump. You even dont have to go fast or rowdy. The sound is kind of like a Shimano EP801 does.
If it is true, what you say, avinox should say the motor is quiter and not totally silent.
They do not say that (totally silent) they say noise is kept below 45 I think i recall - The Avionix M2S drive unit was specifically optimized to reduce sound, with a sound pressure level not exceeding 45dBA.
Don’t get me wrong, I would love my m2s to be totally silent, but it’s not going to be sadly
Don’t get me wrong, I would love my m2s to be totally silent, but it’s not going to be sadly
zakflip
New Member
<45dbA is what Amflow advertise, so most definitely a selling point. However they do word it as 'Reduced' for the M2S. In their 'Ultimate Silence' tagline.
Exactly, reduced not silent. I hold my hand up to not fully reading that before selling my PL Pro to buy the PX pro, and whilst the m2s is def quieter it’s not totally silent. Do I regret the change because of that, no, it’s still much quieter, smoother and more efficient, but any prospective buyer should know it is not silent and has some degree of rattle, might take a ride or two to move the grease about but there will be some noise at some point.
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zakflip
New Member
listening to other motors on rides, the Avinox motor is still very quiet in comparison. (even with the fault mine has)
yep, I agree, it's very quiet and doesn't consistently rattle on every bump like the m1, and even when it does rattle it's much quieter than the m1
a couple more M2S data points for ya
two Pivot Shuttle Amp’d bikes with apx. 690 km and 750 km
No motor rattle noticed.
No gear lash detectable.
Just a slight “purr” under load at times.
#1 (430 miles): 27.5 rear wheel w/ 18t freehub engagement
#2 (480 miles total): 320 miles, 27.5 rear w/ 18t freehub;
160 miles, 29 rear w/ 120 POE freehub
zakflip
New Member
New M2S motor fitted today and back to a much quieter sounding motor, no rasp.
Took it for a 10 mile test ride and all is good again.
Took it for a 10 mile test ride and all is good again.
Let us know how it sounds after about 500 miles
Plenty people with 500miles doing just fine bud. Relax with the snarky Avinox hate. What are you getting from this? Some troll satisfaction?Let us know how it sounds after about 500 miles
Oh dear, if you took the time to read earlier posts by @zakflip you wouldn't make yourself look silly. Bud.
800 miles m2s px pro.
I have some more noticeable raspy noise that i dont think was there before in gears lower than 6 on steep climbs, but no real rattle still. Nothing like the rasp in the video, but nonetheless something I am keeping an eye on. Almost whisper quiet when gear 7 or higher in auto and on relatively flat ground/mild fire road climbs.
I did, however, manage to coax a similar-to-reported rattle noise out by peddling hard under full load at roots before immediately coasting. Very specific, but here is about a half a second window between the overrun finishing and the motor going chill while coasting. In this window of time I can reliably replicate about 1 big slap of that M1 rattle by hitting something chunky, but continuing to coast downhill afterwards there is absolutly nothing more for kms once i'm coasting - silent.
I have some more noticeable raspy noise that i dont think was there before in gears lower than 6 on steep climbs, but no real rattle still. Nothing like the rasp in the video, but nonetheless something I am keeping an eye on. Almost whisper quiet when gear 7 or higher in auto and on relatively flat ground/mild fire road climbs.
I did, however, manage to coax a similar-to-reported rattle noise out by peddling hard under full load at roots before immediately coasting. Very specific, but here is about a half a second window between the overrun finishing and the motor going chill while coasting. In this window of time I can reliably replicate about 1 big slap of that M1 rattle by hitting something chunky, but continuing to coast downhill afterwards there is absolutly nothing more for kms once i'm coasting - silent.
Yotaismygame
New Member
Check your chain stretch and cassette.
slickrock
Well-known member
Not pointing to you specifically, but it might be worth separating out other potential motors issues for the specific topic of this thread, which is M2S motor rattle. Already on this thread there have been conflations between rattle and rasping issues. The true controversy here - of which we are still trying to assess the scope of it and which in the end may be quite limited - is the possibility of a motor specifically designed to address motor rattle that is not working as designed. Any intel on actual first hand broken-in (150 miles +) owner experiences with the presence (or absence) M2S rattle/float and consequent warranty handling where specific rattle exists are of greatest epistemic value, as in separating the signal from the noise.
Fair enough. Essence of my post was "still no rattle".
Thats the data point as one of us with a higher mileage count on the m2s. Well and truly broken in at this point.
slickrock
Well-known member
Are you having a rattle-related issue? If so, please elaborate on the details: miles until occurrence, amount of slop, etc. If not then go to the Avinox support threads. To answer your question, it has to be Crestline you go through. If they sell that motor system to you then they have to support it. May not be the hand-holding LBS experience, but that's the consequcne of the direct model.
3:50 min
"There were some rattle with the m1. Of course, people don't like that. We have now greatly reduced this with the m2 by improving the tolerances and having a slightly different transmission design and with the M2s we were able to eliminate it completely [...]"
For anyone else wondering, a friend decided to send videos to Avinox support of the noise made by moving the chain ring back and fourth to expose the freeplay in the motor (as per the video on page 1). All our motors in our riding group have this to some level (M2 and M2s). And the response from support was this was normal, all motors (including the M2s) has some movement between gears, no movement would indicate too tight tolerances. So if you did get a motor changed under warranty expect a new one to be the same/similar.
- Mar 29, 2026
- 20
- 56
Mine still rattles, and got so loud when you go down stairs,or uneven trails, the bosch gen4 cx rattle is nothing compared to this. Also when the motor is hot, the slow speed pedalling noise with low assistance get very crispy. Did not had the time visit the dealer yet, but heard the same things from several m2s engines.
Overall after 1500km, i hate this bike, still cant find the balance, the motor is pretty annoying, after trying all of the settings it still feels like power is coming from cadence instead of torque sensing. I can only get "natural" feel with low max power levels in customs modes, with high power modes it never feels right, when you climbing slowly, but stand up to push or just use more force because you need to, the motor only respond with power when you cadence increases...
I can see why Orbea needed to touch the tune, this oem Avonix tune is pretty meh... its like a pedal throttle motorbike...
Overall after 1500km, i hate this bike, still cant find the balance, the motor is pretty annoying, after trying all of the settings it still feels like power is coming from cadence instead of torque sensing. I can only get "natural" feel with low max power levels in customs modes, with high power modes it never feels right, when you climbing slowly, but stand up to push or just use more force because you need to, the motor only respond with power when you cadence increases...
I can see why Orbea needed to touch the tune, this oem Avonix tune is pretty meh... its like a pedal throttle motorbike...
Says the guy who’s a Bosch fanboy.
I’ve had the Mondraker Zendit with the M2S since the very beginning;
everything works perfectly, the motor is quiet and far superior to Bosch. The old Bosch CX4 Race is a rattling mess by comparison.
With the M2S motor, I can actually hear my tires on the forest floor again during descents.
Yikes, “Doc”!!! You and @Link (above) led me to the garage to check our Pivot Amp’d bikes (Avinox M2S motors). Neither Mrs levity or I hear any rattle we ascribe to the motor while riding. I checked both bikes for gear lash by rocking the chain and can not detect any. My bike has 640 miles (1,000 km) with 52,000 ft (15,800 m) of climbing. Seems like the motor gears should be settled in by now, but only time will tell.
Regarding motor power delivery: The M2S motor has a wide range of tuning options using the Avinox App. These include max torque, max power, max acceleration, motor overrun, assisted start, and continued assist. The Trail and Auto modes allow you to choose low and high values to adjust how “natural” the assist feels. The M2S motor feels more natural (and powerful!) than any other ebike motor we’ve experienced. What settings have you tried?
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