Chain breaking constantly?

itsjustme

New Member
So my chain has broken twice on two rides. First time I took it to the bike shop. Detailed bent, rotors bent. Had fixed. 2nd bike ride I’m about 5 miles from home and snap. Chain broken again.

Suffice it to say that I am not a happy customer right now.

Aside from sending it back any thoughts or suggestions?
 

roshan

Active Member
So my chain has broken twice on two rides. First time I took it to the bike shop. Detailed bent, rotors bent. Had fixed. 2nd bike ride I’m about 5 miles from home and snap. Chain broken again.

Suffice it to say that I am not a happy customer right now.

Aside from sending it back any thoughts or suggestions?
I'm sorry to hear about this!

The only time a chain breaks is it wasn't installed correctly. Did the bike shop instil quick links correctly when they replaced it?
 

itsjustme

New Member
Roshan. Your original chain broke on my first ride. This was my second ride. The bike shop is very good. I assume they did the repair job correctly.

Please see the email I sent you directly for further details. Having this happen in traffic today was both seriously unpleasant and dangerous. To say nothing of stunningly inconvenient.
 

LimboJim

Well-Known Member
The only time a chain breaks is it wasn't installed correctly. Did the bike shop instil quick links correctly when they replaced it?
Chains can also break when people shift under heavy load, jump multiple gears at once, or shift at a stand still and start pedaling fast. Cross-chaining can also break chains, but I don't think any Biktrix models come with more than one chainring.
 
Last edited:

Mike's E-Bikes

Well-Known Member
You are leaving out a lot of details:

hub drive or mid drive ?
did the chain break at or near the master link ?
What watt rating is the motor ?
What do you mean by 'rotors' ? Are you talking about the front chain ring, or are you talking about the rear cassette, or one or more of the cogs within the cassette ? Or are you talking about the disc brake 'rotor' getting bent ?

If any of the cogs (gears) within a cassette got bent, the entire cassette should be probably be replaced. But having said that, something else is seriously wrong, if any of those gears(cogs) are bent ? Were there any broken teeth in either event ?

And what on the chain broke ? was it a side link, or one of the pins ?
 

itsjustme

New Member
Sorry. Juggernaut FS. Was a pin. Not near the master link. No broken teeth. I've got the cassette being looked at. The rotors I am referring to is that the brake rotors. They were severely bent on arrival.

Super frustrated. 2 rides, two broken chains. Back in the LBS. I'll advise of updates.
 

Nova Haibike

Well-Known Member
I have never seen a broken chain pin, ever. Perhaps you mean the pin separated from the outer link plates? That is the most frequent type of failure. How was the chain repaired the first time? Was the second failure a different link?
 

Mike's E-Bikes

Well-Known Member
You have quite the ebike there. With a motor that is capable of 160 Nm, that is an incredible amount of torque, coupled with full suspension, the engineering dynamics are going to be challenging to get right. 30 amps going into a 1000 watt mid drive, is capable of producing a lot more than 1000 watts. The chain, and chain stay, looks like its fairly long too.

Wonder what kind of lateral movement might be occurring with the full suspension ( and with that much torque) ? Interesting.

Has the shop indicated whether its one of the heavy duty chains such as some of the higher strength rated ones from KMC ?

The folks that buy from Luna Cycles, and are using the higher wattage motors, and the bafang 1000 watt mid drives, on FS bikes that are custom built, have a lot of stories about their experiences and how they handled various issues that can occur with that much power. There are some good forums out there too on the topic of high power mid drives, mainly Bafangs, being used on all sorts of bikes.

Breaking a chain twice like that in a short period of time is a bit unusual. Hopefully it was a new chain each time. But if it was a chain that was 'repaired' , that might explain the second break. Not a good idea generally to repair or re-pin or re-link a chain. and just putting a chain back on without trouble-shooting the original cause of the break, can be a bit dicey. Hope your LBS is good at trouble-shooting, and has some real life experience with mid drives on full suspension bikes. Best solution is to have them in direct contact with the OEM, rather than trying to post any of it here on a forum. Good luck and try to be patient with the shop and the OEM.
 

itsjustme

New Member
Chain was repaired. We've ordered a higher strength "ebike" chain this time around and are replacing it. I'm dubious as to wether and "e-bike" chain is just marketing. LBS has experience with (and sells) mid-drive bikes. They were both surprised by the breaks and are interested in finding a solution. Good guys at the Richardson Bike I'll keep folks updated as this progresses.

I have been in touch with the manufacturer as well.

Thanks all.
 

chriskmee

Active Member
LBS has experience with (and sells) mid-drive bikes. They were both surprised by the breaks and are interested in finding a solution
Just curious, does your LBS sell bikes with a mid drive motor as powerful as the one you have? I can understand hub motors being 1000W+, but with a mid drive putting all that energy and torque through a bike chain designed around humans seems like a great way to break chains. The more common mid drives are more like 250W or 350W
 

itsjustme

New Member
Chriskmee- No. Not many folks as best as I can tell sell mid-drives with that power. At least not in Dallas. But the response from the manufacturer as essentially been "that shouldn't happen" and "you shouldn't need a new chain, just repair the broken link." And, in fairness, "send me the invoice for the repair of the chain." So we are going to try and work through it as best we can.

I'll keep folks apprised of the results.

Thanks!
 

Trail Cruiser

Well-Known Member
Chriskmee- No. Not many folks as best as I can tell sell mid-drives with that power. At least not in Dallas. But the response from the manufacturer as essentially been "that shouldn't happen" and "you shouldn't need a new chain, just repair the broken link." And, in fairness, "send me the invoice for the repair of the chain." So we are going to try and work through it as best we can.

I'll keep folks apprised of the results.

Thanks!
What gear were you when when the chain broke while starting from a stop? Did you full throttled it? Were you in the highest PAS level?
 

Mike Sloan

New Member
Chain was repaired. We've ordered a higher strength "ebike" chain this time around and are replacing it. I'm dubious as to wether and "e-bike" chain is just marketing. LBS has experience with (and sells) mid-drive bikes. They were both surprised by the breaks and are interested in finding a solution. Good guys at the Richardson Bike I'll keep folks updated as this progresses.

I have been in touch with the manufacturer as well.

Thanks all.
Read about your issues with chain breaks....what was the final verdict? Any advise or mods we can make to alleviate this problem?
 

mbouck

Member
If the brake rotor was bent (assuming this is the rear wheel) then that would seem to indicate there was some damage during shipping. It could be the wheel itself might be out of true or the cassette was also damaged (e.g. bent cogs, etc.) If this is the case then I would say that's the primary reason for the chain breaking vs. anything going on with the motor or the chain itself. I'd have your LBS check the trueness of the wheel/cassette and your chainline. I'd also check the derailleur hanger - make sure it's not bent.