Not a great start with e-bikes. Chain continually jumps off the front sprocket.

Vim Fuego

Pedelecer
Mar 21, 2021
50
4
So my wife bought a Haibike SDuro 1.0 2020 from Tredz online in December, and it was fine for a month or so, but recently the chain keeps jumping off the front sprocket and jamming down between the motor housing and the sprocket, when it does this, it's jammed solid, there is no chance of a roadside fix. She phones me up, and I have to go out with a chain splitter, split the chain, pull it out and rejoin it.

It obviously shouldn't be doing this. She has lost all confidence in the bike, and disheartened that a bike this expensive is doing this, and when it does it, poor design from Haibike/Bosch means that it's not an easy recovery.

Both the retailer and the manufacturer have washed their hands of the problem, it seems bikes are sold without any kind of support or legal responsibility.

I looked into chain catchers, but I am somewhat loathed to use one, as it feels like it would be masking the problem.

Any advice on how to get this sorted and restore my wife's confidence in her bike? Also anyone recommend a chain catcher that fits a SDuro (the ones I look at clamp round the frame upright, but that wouldn't work, as the motor casing rises higher than the top of the front sprocket.

Thanks.
 
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Deleted member 33385

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So my wife bought a Haibike SDuro 1.0 2020 from Tredz online in December, and it was fine for a month or so, but recently the chain keeps jumping off the front sprocket and jamming down between the motor housing and the sprocket, when it does this, it's jammed solid, there is no chance of a roadside fix. She phones me up, and I have to go out with a chain splitter, split the chain, pull it out and rejoin it.

It obviously shouldn't be doing this. She has lost all confidence in the bike, and disheartened that a bike this expensive is doing this, and when it does it, poor design from Haibike/Bosch means that it's not an easy recovery.

Both the retailer and the manufacturer have washed their hands of the problem, it seems bikes are sold without any kind of support or legal responsibility.

I looked into chain catchers, but I am somewhat loathed to use one, as it feels like it would be masking the problem.

Any advice on how to get this sorted and restore my wife's confidence in her bike? Also anyone recommend a chain catcher that fits a SDuro (the ones I look at clamp round the frame upright, but that wouldn't work, as the motor casing rises higher than the top of the front sprocket.

Thanks.


Mine did that till I removed two links (Bafang BBS01b kit). Have they fitted the wrong length chain? If it was fine for a couple of months, has the chain stretched? If you're using a chain splitter regularly, are you leaving a link too tight? Is your drive chain wearing out? Would replacing the chain, cassette etc. solve the problem?


 
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Vim Fuego

Pedelecer
Mar 21, 2021
50
4
So I followed her whilst out on a ride, and there is quite alot of bounce in the chain whilst cycling, and compared to my bike (a SDuro 3.0, which has a Shimano Deore which has a clutch), hers has significantly less chain tension (even without the clutch engaged).

Is there a way to measure chain tension?
 
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Deleted member 33385

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So I followed her whilst out on a ride, and there is quite alot of bounce in the chain whilst cycling, and compared to my bike (a SDuro 3.0, which has a Shimano Deore which has a clutch), hers has significantly less chain tension (even without the clutch engaged).

Is there a way to measure chain tension?

There's a chain stretch measuring tool:


...and if it hasn't stretched, I would remove links one at a time until it stopped happening. If that didn't work, I'd investigate alignment issue possibilities. There seem to be a lot of people having chain issues with that bike on youtube. I think it might be likely that you'll have to figure out a fix to live with a flawed design.
 

Vim Fuego

Pedelecer
Mar 21, 2021
50
4
Is it possible to work out if the chain is too long by looking at the angle of the derailleur? Took a couple of pics, top gear and bottom gear,

41437

41438
 
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Deleted member 33385

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Is it possible to work out if the chain is too long by looking at the angle of the derailleur? Took a couple of pics, top gear and bottom gear,

View attachment 41437

View attachment 41438


I tried doing that for my bike after looking at many online guides (formulas, angles, sag etc), and it got me into the right ballpark for the correct number of chain links for my old and strange bike - then I had to take a couple of links off till it worked. In my case, it was all brand new: chain, cassette, front (Bafang) crank, so wear wasn't a factor, but it may well be on yours. Why would your bike diverge from the specified number of links for your bike design?
 

Vim Fuego

Pedelecer
Mar 21, 2021
50
4
Why would your bike diverge from the specified number of links for your bike design?
I was wondering the same, but to be honest, I don't know how internet sellers of e-bikes operate behind the scenes. When you buy from a Haibike from Tredz and they have to prepare your bike, what are they actually doing? Building it from what level?

As for wear, something is seriously wrong, surely, if something is worn after 300 miles.
 

vfr400

Esteemed Pedelecer
Jun 12, 2011
9,822
3,945
Basildon
Before doing anything, you could try adjusting the B screw on the back of your derailleur to put a bit more tension on the chain in top gear.

A logical question would be: Does it only jump off in top gear? If the answer is no, none of this will help and you'll have to look for a chain guide of some sort.
 

georgehenry

Esteemed Pedelecer
Nov 7, 2015
1,155
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Surrey
Obviously finding the course would be the best thing to do.

However my 2015 Haibike Sduro Yamaha hard tail mountain bike that came with a rudimentary chain guide would very occasionally drop the chain and then do so more often when the drive train was worn but stopped dropping the chain completely when I replaced the worn out cassette, chain and chain ring and replaced the old chain ring with a narrow wide chain ring.

I now really like narrow wide chain rings as they are generally quite substantial, resistant to wear, and grip the chain in a way that completely stops it dropping off.
 

Nealh

Esteemed Pedelecer
Aug 7, 2014
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Check each chain link for any damage twisting or a pin that may have come out of link plate.
 
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budsy

Banned
May 16, 2020
269
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This makes people wary of buying a new e bike online as any decent sellers of e bikes then you would think would look into this problem.. and have someone with experience come to look at it in front of you and fix this ...and if they cant then take the bike away and replaced with a new one the same in good working condition ... Not good enough when people pay so much as e bikes aint cheap ... and least we all would want is help when something isnt right when just had bike under a yr .. Just doesnt sound like a good retailer or manufacturer as they are ignoring ..sounds like thats the case then id name and shame both retailer and manufacturer online all around bike stores/forums everywhere ... this only after u have as said told them whats wrong and it needs sorting out and u want someone come and either fix for free or replaced ...and if they then dont give you help at all then open them up to all via internet and word of mouth around you .. Quick edit - Just seen this which is a good read and you should take a read of this ..https://www.pedelecs.co.uk/choose-electric-bike/
 
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Deleted member 33385

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Also anyone recommend a chain catcher that fits a SDuro

When I first bought my Dahon, I was surprised to find this curious lump of nylon, which might be of interest to you:



41462



It made me laugh! Looked like a bodge, an elastoplast stuck over a bad design choice somewhere along the chain...

It looks easy to make - if you can't find something similar that fits. I refuse to believe that anything which fits a old Dahon frame, would fit anything other than another old Dahon frame.

Yes, I know the bike is very dirty, but so is the man riding it :p
 
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Vim Fuego

Pedelecer
Mar 21, 2021
50
4
When I first bought my Dahon, I was surprised to find this curious lump of nylon, which might be of interest to you:



View attachment 41462



It made me laugh! Looked like a bodge, an elastoplast stuck over a bad design choice somewhere along the chain...

It looks easy to make - if you can't find something similar that fits. I refuse to believe that anything which fits a old Dahon frame, would fit anything other than another old Dahon frame.

Yes, I know the bike is very dirty, but so is the man riding it :p
I don't think it would fit.

PXL_20210321_095709981.jpg
 
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Deleted member 33385

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I don't think it would fit.

View attachment 41463


Sugru? A huge mass of? Then glue it on? You might have to experiment with different shapes... then add a nylon bit where it contacts the chain. It might not work at all. Or wood with a nylon chain facing part? Or carve it out of one big block of nylon? Nylon is easy to work but still takes ages - I made nylon hinges for a tilting techical drawing table ... it was hell, but it still works. That nylon part on my Dahon has lasted decades, which is a bit of a surprise. Nylon seems quite durable, in the right application. It's a bloody awkward location though. Maybe you could start with a latex mould, then use that as a guide for whatever you try and improvise to fit? Fill the mould with fibreglass and/or sawdust and epoxy and then add nylon where it limits the chain? (after shaping). Shape a big hunk of aluminium and drill/thread it on? Or make the shape you need out of clay or Sugru and get someone to cast it?

It'd be great if you didn't have to reinvent the wheel and found something which will do the job - oodles of Googling in Google Products is needed methinks, and everywhere else.

Accurate 3D laser scanning isn't cheap - it'd be helpful if manufacturers released 3d models of all products as CAD files, so that people could design and 3D print something which fits exactly.

Of course, sorting out whatever is causing this problem is a better solution.


???:



Who knows? Maybe you could do it with a handlebar GoPro mount with extensions holding a block of nylon, then glue the joints together when they're at the right position. No that wouldn't work, it'd break :eek:
 
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georgehenry

Esteemed Pedelecer
Nov 7, 2015
1,155
1,013
Surrey
Always best to identify and sort out the underlying problem.

I tight link in the chain, or badly set up derailleur. Hopefully the chain should be the right length but you would not want it too long.

When you are sure its all set up properly a narrow wide chain ring is in my opinion much more effective than a chain guide.

I once had a situation when my rear hub was wearing out that when free wheeling the chain was still pushed around rather than stationary and this also caused the chain to be dropped.

A new rear hub sorted that out.

But this is a new bike so it should be something related to derailleur set up, or a tight link in the chain.
 
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georgehenry

Esteemed Pedelecer
Nov 7, 2015
1,155
1,013
Surrey
I appreciate this particular horse has bolted, and depending on where you live it can be hard to achieve, but buying from a local dealer where you can easily take the bike back to if you get teething problems can be very helpful.

I bought my Haibike Yamaha crank drive bike in 2015 from a dealership 10 miles away and they have always been very helpful, replacing my first motor free of charge under the warranty right on the two year ownership point with no quibbles.

However a really well supported mail order set up like Woosh I am sure would also be a very good second best to a physical local dealership.

Really a set up that is not just interested in your initial purchase but happy and able to offer ongoing support. The whats new page of the pedelec site is usually dominated by owners with problems, so you should expect to have to fix your electric bike at some point.
 

vfr400

Esteemed Pedelecer
Jun 12, 2011
9,822
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I don't think it would fit.

View attachment 41463
The photo shows that the chain is slipping off the outside of the chainwheel, so a normal chainguide wouldn't work. You need one that guides both sides, like this:

Here's one specially for Bosch Gen 4 motors:
 
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WheezyRider

Esteemed Pedelecer
Apr 20, 2020
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What I'd do is first of all, buy a new chain, as the one you have has now been subjected to all kinds of grief and it could well be damaged. They are not expensive to replace and they don't last long anyway.

Then rotate your cranks slowly and see if the front chain ring has been bent. Is it straight and true?

Then check that your derailleur hanger isn't bent. Is the chain line straight, relative to the front chain ring?

Then check the tension of the derailleur adjustment, see if that can be tightened.

Then remove links if the derailleur is already at maximum tension.