Article Is the Shimano EP8 a bad motor?

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knut7

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We see some comments about how bad the Shimano EP8 motor is. Some claim it’s a dangerous motor that suffers spindle failures. Some say it’s unreliable with a high risk of getting bricked. Others will tell us the EP8 is a weaker motor.



ep8fail02-1024x405.jpg




We haven’t really got an opinion about durability. We test a lot of different motors but never ride the same motor for several hundred kilometres. So we asked 4 local shops, or should I say 3!? All of them are big shops that service a lot of ebikes, mostly Bosch, Shimano and some Yamaha. This isn’t a proof of anything, just the opinion of the guys we happened to talk to. None of the shops had any data of motor systems sold versus motors returning with a failure.









Power?



How about motor power? We did a comparison of the Bosch Performance CX 85 Nm against the Shimano EP8 85 Nm a while ago.
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Continue reading...
 
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Before buying an Ebike 3 years ago i started reading a lot and i still read about Ebikes.
None of the Shimano atracted me, they are not reliable.
The 7,000, the 8,000 and the new one.
Motor or battery etc... way too much problemsssss.
Without a car i ride Ebikes 350 days each year.
A bike in the shop means i have PROBLEMS.
My Ebikes are problem free.
The Shimano have not been reliable in the last 4 years.
If you like reliable read, ask, find a good or great Ebike.
 
I'm not convinced the E8000 is any more unreliable than the Bosch. D From what I've seen in my own group of friends, the difference is that Bosch support their motor unconditionally, whereas in the UK Shimano/Madison appear to want to wash their hands of it whenever possible.

I'm going to sell my Merida as soon as I can lever a new motor out of Madison, and I'm replacing it with a Rail. An expensive mistake to have made.
 
The complete lack of repairability, plus a battery that has lost a significant amount of capacity in less than 8 months, means I won't get another Shimano ebike.

I wish reviews would focus on this sort of thing rather than comparing how much torque they've got and how fast they are up climbs and so on.

As a customer, we have pretty much zero ability to communicate with Shimano, it all goes through shops, so perhaps if reviews highlighted this they might take some notice.
 
Ease of service might be different in different parts of the world. Around here, Shimano has been fairly easy to deal with. I've had issues with Bosch, Yamaha and Shimano on my own bikes. But it's been a while ago, back before I did many reviews.

Bosch was dificult, they wanted to inspect the unit in Germany before making a decision, so any warranty claim would take weeks. Shimano was easier, a Shimano cerified service center could do the job. For Yamaha, I went to the distributor of the bike I bought, Haibike in my case. That worked well too, but it can depend on the company that handles the import and distribution in your country.

With Bosch, a bike shop can stock parts/motors, and they can decide if the issue is warranty and swap the part them selves. In that case any warranty repairs can be very smooth. It can be worth having a good LBS that has the resorces to take care of me. There is a real risk of failure with any brands. Especially regarding Shimano vs Ethirteen cranks. In my experience, Shimano seem to stand behind their products as long as the bikes are built with approved parts. In this particular case, it seems the bike manufacturer is taking the responsibility.
 
What about “ease of service” after the warranty expires ?

In your part of the world are there third party e motor repair shops starting up and if so do they repair out of warranty e8000 and ep8 motors ?

I‘m in the UK, there are third party repairers starting up but to my knowledge there aren’t any 3 party repair shops who are prepared to work on the e8000/ep8 motors(Bose, Bosch, Yamaha are covered). This, in conjunction with my experience of the e8000 (1st motor, failed at 2000 miles, 2nd motor, starting same type of fail at 1000 miles) and nobody was prepared/available to rebuild iI means that I just decided not to buy an orbea rise m-ltd (*it was even in about a 15% off sale) most irritatingly it was exactly what I want, a lighter, full fat ebike with an add on battery extender but in my experience it would likely prove very costly out of warranty.

In my opinion its a bad motor, because of its lack of built in rebuildability, I liked the performance/behaviour/controls of my e8000 and I’ve deliberately bought shimano bike running gear since about 1990 as it works really well but until they produce a motor that can be rebuilt I’ll be avoiding them as a motor supplier.
 
It would be valuable to know the mode of failure before passing judgement. If the E13 crankset causes an issue, can’t blame Shimano for that!
 
towzer said:
What about “ease of service” after the warranty expires ?
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Yeah, you're right! I've got no experience with that, only how warranty requests/repairs are handled. We are so fortunate to have 5 yrs of warranty here. So it's mostly just a few Yamaha PW and Bosch Performance (not CX) emtb motors that are out of warranty so far. I ask Shimano about repairability every chance I get, and I will keep doing it. As I say in the video; yay right to repair!
 
When I was researching what bike to buy last year many of the bikes I was interested in had the EP8 motor in, after reading about the issues with reliability and dealing with warranty claims they were all crossed off my list.
If things improve then maybe I’ll reconsider in a couple of years when I might want to replace my bike.
 
Over on the USA MTBR mountain bike (ebike forums) forums, there are a very large number of posts about people left hung to dry with the Shimano motors. What is interesting to me is how many e-mtb manufacturers have gone all-in with the Shimano ebike drive system. Makes me wonder if Shimano has done some undercutting as the lowest bidder in order to become the exclusive ebike drive manufacturer of that particular bike brand.

Just a couple of observations"

1. Regards to the first video, it's not reasonable to expect any bike shop owner who deals with Shimano to outright bash the product "on camera". No, the only place our two youtube v-loggers are going to find their questions about Shimano reliability answered are in forums like this one and over on the USA MTBR ebike forum. The answer lies with the bike owner; not some shop owner who depends upon Shimano to make a living.

2. Regards to spindle cracking; looking at how lightly built that spindle appears to be, it behooves every Shimano rider to avoid pedal strikes at all costs.
 
Mike TowpathTraveler said:
Over on the USA MTBR mountain bike (ebike forums) forums, there are a very large number of posts about people left hung to dry with the Shimano motors. What is interesting to me is how many e-mtb manufacturers have gone all-in with the Shimano ebike drive system. Makes me wonder if Shimano has done some undercutting as the lowest bidder in order to become the exclusive ebike drive manufacturer of that particular bike brand.

Just a couple of observations"

1. Regards to the first video, it's not reasonable to expect any bike shop owner who deals with Shimano to outright bash the product "on camera". No, the only place our two youtube v-loggers are going to find their questions about Shimano reliability answered are in forums like this one and over on the USA MTBR ebike forum. The answer lies with the bike owner; not some shop owner who depends upon Shimano to make a living.

2. Regards to spindle cracking; looking at how lightly built that spindle appears to be, it behooves every Shimano rider to avoid pedal strikes at all costs.
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Good points!
This thread is really dissapointing to read. I have a Yeti E160 on order. Its just astonishing to me that Yeti would put that motor into a $13k bike with all the research and design work that went into that bike.
 
wow, 5yr warranty - that would be fantastic, in the Uk it’s normally 2 years on the motor. If we got a 5 year warranty I’d still say I would be disappointed in the non repairability aspect but I reckon I could accept a max cost of £200 per year on the motor (*call a motor £1000 in the UK, so spread over 5 years minimum as opposed to 2).

As an alternative maybe shimano should start selling reconditioned engines, with a 2 year warranty, (*surely they must be able to rebuild them and deal with the software) that would both prevent waste and provide a cheaper way to keep customers happy once out of warranty. (? does anybody know what happens to all the warranty return motors).
 
At the price paid for a Shimano Ebike i cannot afford 2 so even if they replace or repair free it is not attracting.
I want to pedal, recharge, repeat.
WAKE UP shimano.
 
shakeystart said:
Good points!
This thread is really dissapointing to read. I have a Yeti E160 on order. Its just astonishing to me that Yeti would put that motor into a $13k bike with all the research and design work that went into that bike.
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As a followup...Yeti gives a lifetime warranty on the frame. The motor and battery are integral to the frame. There is no mention of the motor warranty separate from the lifetime warranty. Hmmm.
 
shakeystart said:
As a followup...Yeti gives a lifetime warranty on the frame. The motor and battery are integral to the frame. There is no mention of the motor warranty separate from the lifetime warranty. Hmmm.
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Yeti treat the motor as a separate component from the frame, so you’re stuck with whatever the Shimano warranty is in the country of purchase unfortunately 🙁
 
MrSimmo said:
Yeti treat the motor as a separate component from the frame, so you’re stuck with whatever the Shimano warranty is in the country of purchase unfortunately 🙁
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Yeah I’m sure it falls under the 2 year Shimano warranty, but if a layman just reads the literature they could be mislead.
 
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I have done 3400Ks on a Merida E160 10K. Has the ep8. Been 100 percent reliable. I have had two Shimano relate problems that were either operator error--broken battery release, or 2 a broken control cable due to factory assembly of the internal routing of cable through the stem.
The biggest EP8 issue is the range/power. No matter what I do, there is no way to match Bosche and Brose on this bike. Much is dad about the EP8 being a natural feeling motor, and thats true. But what is also true, is that this is a deflection from the fundamentals. Basically in my exhaustive tests the Bosche gives 25-30 percent more range for similar power - tested on timed runs on a control climb with same heart rate.
 
Basically SHITMANO is a scheme.
It has been for 4 years.
Stop buying shit.
Manufacturers and retailers will make better offers.
I will not pay money for a lighter motor
I will not pay for a smoother motor
I want somethings that works in real life not just on paper.
Vote with your money, boycot the SHIT . . . .
 
Mr Scooter said:
I have done 3400Ks on a Merida E160 10K. Has the ep8. Been 100 percent reliable. I have had two Shimano relate problems that were either operator error--broken battery release, or 2 a broken control cable due to factory assembly of the internal routing of cable through the stem.
The biggest EP8 issue is the range/power. No matter what I do, there is no way to match Bosche and Brose on this bike. Much is dad about the EP8 being a natural feeling motor, and thats true. But what is also true, is that this is a deflection from the fundamentals. Basically in my exhaustive tests the Bosche gives 25-30 percent more range for similar power - tested on timed runs on a control climb with same heart rate.
Click to expand...
Exactly my experience with E8000 too.
 
Rob Rides EMTB said:
No idea what you are all worried about, just get a Bosch. Worry free miles.
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ha, good one - I'm on bosch motor number 2, and kiox display number 2.

I think the reality is that currently all motors have issues , there is no one motor that is perfect, but it seems the bosch is the best of a bad bunch to me.

I've got 3 mates with the shimano ep8 - one of them is on his 3rd motor in about 400 miles, the other two have been fine - but they dont ride very often
 
Growmac said:
The big difference in the UK is that Bosch appear to sort the problems quickly and with no argument. That's worth a lot.
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I was chatting to the owner of my LBS last week when I went in to collect my mates EP8 motor'd bike after having a new motor (the 3rd motor) fitted. This LBS is a bosch , shimano and specialized dealer, he was saying that all of them are easy to deal with in terms of motor warranty repairs/replacements, which clearly doesnt tally with some shimano owners on here experiences.
 
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