Will the Shimano EP801 motor overrun kill your drivetrain?

[@danielborg7973]

Takk for den jobben dere gjør i emtb! Spesielt interessen dere viser for forslaget til ny motorferdsellov! Stå på!👊

[@EMTBVideos]

Det var hyggelig, takk for det!

[@avlehtine]

I have the Vitus E-Mythique with Bafang M510 that has basically non-configurable overrun, longer on the higher assistance levels. I do find that easing off the pedals (as in still pedaling but with less torque) will cause the motor to also reduce assistance quickly, but completely stopping will have the motor put out the full overrun power. Haven't tested this extensively, so I might just be imagining it. I did wear out some of the sprockets (no visible wear or damage, but the stock chain (less than 0.5 wear) and a new one I tried skip on the most used cogs) on the original Microshift cassette. I went to 11 speed LinkGlide and so far am very impressed. Shifts are maybe a bit slower than some of the other stuff, but are extremely "solid" even under load. Thanks for the video!

[@koslan2646]

i understand your point put having using the overrun feature for a few days now i can't say there is a problem at least for me. you don't need to pause to wait for the overrun to stop and then shift. Just pedal with less rider torque/rider input when you want to shift and you avoid the big stress on the drivetrain.

[@EMTBVideos]

Yeah, there are many situations where you can shift gently even with carryover set to "long". But there are situations where the motor keeps the power up even though we ease of the pedals. When going uphill as fast as you can and trying to downshift, you'll need to pause and you'll lose the momentum to the point where it's no point downshifting anymore. We just end up shifting under high load more often with the carryover at max.

[@hassebir]

Love the Linkglide 10 spd. Durable anf shifts under load. Dirt cheap. Good spacing between gears for a full fat ebike :)

[@NoNotAChance]

If you don't like overrun on an EP801 - dial it back. It IS configurable in several ways. Looking at your broken chain, I do not believe that overrun had much to do with that. I expect it was either an abused chain or it had a manufacturing fault. I raced and tested MX bikes and components for many years and except for a few bikes that had say a 428 chain when a 520 was appropriate, virtually all of my chain breakages were quality control issues. Back to bicycles, racing singlespeed bikes for many years and being of larger build I have broken more than a few chains - until I stopped being a weight weenie and started using the correct chain for the job. Just like the SS, no ebike should be fitted with any hollow pin chain as they do not handle the torque loads well - they are for high cadence type riders. Having been on ebikes for a long time now I have seen a few broken chains - mostly with inexperienced riders who use the motor power on climbs rather than shifting correctly.

[@EMTBVideos]

Yeah, the overrun is configurable, we've done a test of the various settings. And when riding maximum assistance and maximum overrun, there will be situations on every ride where we end up shifting under high load. We don't claim overrun is the only reason this particular chain snapped. And yeah, perhaps contaminated steel was the problem in this case. But it got us thinking about how much more stress the motor is putting on the chain compared to motors running the default settings or older firmwares. A few people are talking about shifting correctly. But that's the point, it becomes more difficult or even unavoidable shifting correctly with assist carryover set to "long". In some situations.

[@dshow1658]

I’ve had no problems. Just respect your shifts

[@jontoad]

My Pivot Shuttle LT has the 801 with the update. I'd rather have the overrun and cross that bridge when i come to it than worry about it. I kinda want to switch to GX Transmission anyways, but the Shimano XT stuff is worth keeping for now since it came on the bike.

[@vert_n_dirt]

Maybe one day you can get your hands on a 3x3 hub for a test. I think its lighter than rohloff, and that other hub(forget the name) you tested is OOB, and the 3x3 has some interesting features. It'd be interesting to hear your thoughts

[@shmulikklapwald9884]

Isn't the overrun canceled by momentary backpedaling? If so no more issues

[@CarkeekW]

Yes

[@EMTBVideos]

It used to, but this is the 4.3.0 firmware with the new overrun feature. Here's my video when I tested the different settings. As you can see, I'm backpedaling quite a bit and the motor is still pushing kzbin.info/www/bejne/lYDIZniFZtGabMksi=zypbWDyC2BFavf9b&t=317

[@edilbertoa]

Hi! I was wondering if you have ever been able to unlock a Shimano EP801 motor with an E299 error code? I am having such a hard time to find someone who can fix it from being on a safe mode. Can you or anyone help?

[@EMTBVideos]

I've used the Shimano PCE02 a few times, but I've never tried removing error codes with it. Unfortunately, I haven't got a better suggestion than contacting a Shimano certified shop. If there is none close to you, it can allegedly be done remotely. I've never tried, but word is you can connect your bike to a computer using the PCE02 and the shop should be able to connect remotely.

[@richardkaz2336]

There have been reports of shoddy Chinese Shimano chains having micro cracks in the linkage plates around the pins due to bad metalurgy or production methods.

[@johnwilliamson9453]

Can you adjust the overrun?

[@EMTBVideos]

Yeah, it comes in the Short setting by default, which is similar to how it used to behave. It can be increased to middle or long. Here's my video about the settings kzbin.info/www/bejne/lYDIZniFZtGabMk

[@JoLe1991]

overrun without a shift sensor will kill your chain and cassette one shift at a time. adding overrun intentionally to the motor firmware is just plain stupid. trying to back off during shifting but the motor just keeps going...

[@BramBiesiekierski]

LOL. Shimano isn't powerfull enough to hurt chain. Need bafang or cyc power for that lol

[@JoLe1991]

it all depends on the level of cross chaining. The more cross chaining, the less torque it requires to snap the chain.

[@timgearing5121]

Wow, you broke a chain on a media test bike,why am I not surprised.🫢 A chain is an expendable,like brake pads and tyres…don’t like that idea? Well maybe mountain biking ain’t for you. Ride safe…and don’t mash the gears 😅

[@EMTBVideos]

The point is it can be difficult avoiding mashing the gears with assist carrover set to max.