e-bike specific chains?
07-19-23, 01:58 PM
#1
ignominious poltroon
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e-bike specific chains?
Shimano, KMC and I assume others manufacture an e-bike specific version of their chains.
Is the difference significant enough to warrant purchase? My main concern is breaking a chain, not how fast I will wear it out.
I've been using XTR 11-speed chains on my bikes, including my wife's 11-speed 105-level Cannondale/Bosch ebike. Nothing bad has happened with hers, but she isn't exactly torquing it to death. I just put one on my 11-speed mountain bike conversion, but am now wondering if a CN-E8000 11-speed ebike specific "STEPS" chain might be a better choice?
Is the difference significant enough to warrant purchase? My main concern is breaking a chain, not how fast I will wear it out.
I've been using XTR 11-speed chains on my bikes, including my wife's 11-speed 105-level Cannondale/Bosch ebike. Nothing bad has happened with hers, but she isn't exactly torquing it to death. I just put one on my 11-speed mountain bike conversion, but am now wondering if a CN-E8000 11-speed ebike specific "STEPS" chain might be a better choice?
07-29-23, 03:37 PM
#2
Banned
The added wear on e-bike chains is when it has to absorb the tension of the motor drive and the chainring at the same time. The 70 lb Class II bikes are likely to put more stress on the chain than a 30 lb Class III e-bike or a commuter bike ridden primarily on flat ground. The SRAM PC-GX Eagle chains are made for electric mountain bikes (Turbo Levo) and are very strong and smooth chains.
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07-29-23, 04:35 PM
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I've been using inexpensive 8-speed chains on my BBS02-equipped MTB for eight years (my wife and son for shorter times) and have never had an incident. I used to carry a "quick link", in case there was a problem, but stopped several years ago since it was superfluous.
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07-31-23, 11:20 PM
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I converted several older steel bikes to 10 speed cassette with the appropriate 10 speed chain. I have since found that the jewel like 10 speed chains wear rather quickly. I bought a RAD City with a 7 speed rear freewheel. The chain is beefy as heck and I'm finding that it is wearing much better than the 10 speed chain. I recently found out about the heavier duty chains being put on e-bikes and I suspect that is what is on my RAD. May be going back to 7 speed setups on my old steel bikes with e-bike chains.
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08-05-23, 11:40 AM
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My understanding is that the e-bike chains are not intended to increase life over a regular chain. They wear just as quickly.
The difference is how the plates are peened. E-bikes are far more likely to be shifted under load, which puts a heavy side-load on the chain. The stronger peening makes the chains more resistant to breakage when an inexperienced rider shifts without taking enough load off of the pedals. Some e-bikes also have a significant torque lag (torque continues to be applied after the rider stops pedaling) which makes the problem even worse.
The difference is how the plates are peened. E-bikes are far more likely to be shifted under load, which puts a heavy side-load on the chain. The stronger peening makes the chains more resistant to breakage when an inexperienced rider shifts without taking enough load off of the pedals. Some e-bikes also have a significant torque lag (torque continues to be applied after the rider stops pedaling) which makes the problem even worse.
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08-05-23, 11:45 AM
#6
ignominious poltroon
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I bought one of the Shimano 11-speed e-bike chains on sale (25% off Shimano stuff at REI), and put it on. If there is a difference, I can't see it. The peening explanation makes sense. It was also the longest chain I have ever seen (136 links I think, about 20 more than I needed). Now at least I can use my XTR chain for its original intended purpose.
08-06-23, 09:20 AM
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From another thread, but the poster says he works for KMC
Like others have said I just buy standard chains, replace them when they are worn and haven't had an issue
Like others have said I just buy standard chains, replace them when they are worn and haven't had an issue
The primary difference of our e-bike chains vs regular chains is the pin riveting technology used. Extended durability is an added bonus from us as e-bike riders usually ride farther.
Mid motors exert massive force across the chain between the chainring and cassette. When shifting under this load, the torsional stress is immense and this is where most chains fail on e-bikes (unfortunately, also on regular bikes on occasion). The issue is the chain plates are pulled in opposite directions when shifting on cassette teeth while the motor is pulling the chain. If a regular chain hasn't shifted correctly by the time it makes it to the top of the cassette and is "twisted", the pin power may not be enough to hold the chain together and calamity may ensue where the plate pulls away from the pin. Our new ebike-specific chains have a larger pin that is riveted in a completely different way than regular chains and have been recognized by ebike brands and product managers around the world. Check your favorite brands ebike specs and you'll see many are already using our ebike chains.
Mid motors exert massive force across the chain between the chainring and cassette. When shifting under this load, the torsional stress is immense and this is where most chains fail on e-bikes (unfortunately, also on regular bikes on occasion). The issue is the chain plates are pulled in opposite directions when shifting on cassette teeth while the motor is pulling the chain. If a regular chain hasn't shifted correctly by the time it makes it to the top of the cassette and is "twisted", the pin power may not be enough to hold the chain together and calamity may ensue where the plate pulls away from the pin. Our new ebike-specific chains have a larger pin that is riveted in a completely different way than regular chains and have been recognized by ebike brands and product managers around the world. Check your favorite brands ebike specs and you'll see many are already using our ebike chains.
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08-06-23, 07:31 PM
#8
almost like new
My understanding is that the e-bike chains are not intended to increase life over a regular chain. They wear just as quickly.
The difference is how the plates are peened. E-bikes are far more likely to be shifted under load, which puts a heavy side-load on the chain. The stronger peening makes the chains more resistant to breakage when an inexperienced rider shifts without taking enough load off of the pedals. Some e-bikes also have a significant torque lag (torque continues to be applied after the rider stops pedaling) which makes the problem even worse.
The difference is how the plates are peened. E-bikes are far more likely to be shifted under load, which puts a heavy side-load on the chain. The stronger peening makes the chains more resistant to breakage when an inexperienced rider shifts without taking enough load off of the pedals. Some e-bikes also have a significant torque lag (torque continues to be applied after the rider stops pedaling) which makes the problem even worse.
However, KMC is the only chain manufacturer that uses a unique riveting process to flatten the pin thus significantly increasing pin power. This better holds the chain plates together, preventing the plate peeling off and resulting chain failure. Pin difference shown below
Standard (left) vs e-series chain pins (right)
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08-06-23, 10:04 PM
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I didn't know about the peeling problem and I've not had that issue with my 10 speed chains. What I'm looking for is better materials, longer wearing materials, and frankly a wider pin and roller assembly to spread wear over a greater surface area. 7 speed chain is wider that 10 speed chain and this width is in pin and roller length, both of which are the wear areas of a chain. I was glad to see the recommendations for tougher chain and will seek it out for my 10 speeds. No chains last forever but my e-bike 7 speed chain has been bulletproof with little signs of wear over 3000+ miles. I ride in Pedal Assist mode 1 and pedal all the time. I try to maintain a 12 to 15mph speed. Pedal Assist mode 1 on my RAD is 50 watts of power so you have to add some watts of your own to maintain higher speeds.
08-09-23, 02:44 PM
#11
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Chains on an e-bike have to handle higher loads with the combined pedal power of the rider and the power applied by the drive motor. I use standard Shimano chains for 11-speed bikes on my e-road bike and have spare chains as I expect the chains to last half as long. The price has dropped for the chains by more than 30% from its pandemic price gouging level.
Over reliance on the bike motor going up hills is going to shorten chain life so I drop to the same gear I would use without the motor and go up the hills at the same speed.
Over reliance on the bike motor going up hills is going to shorten chain life so I drop to the same gear I would use without the motor and go up the hills at the same speed.
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08-09-23, 03:07 PM
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when I tested a regular shimano chain to their ebike chain I got 1000 more miles 2000 verses 3000 but it was twice the price. I am testing the KMC chain right now as Now I need a longer chain so after having to split a second chain and buy more quick links its not such a bad deal.
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08-09-23, 03:56 PM
#13
ignominious poltroon
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The 136 links was 20 more than I needed, but if this is an issue for someone, it alone would be a compelling reason. I got the e-version on sale, so it was cheaper that the XTR/Dura Ace one I was going to use.
I wax my chains, and for non-ebikes at least, that really helps with the lifespan.
I wax my chains, and for non-ebikes at least, that really helps with the lifespan.
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08-12-23, 05:18 PM
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When I rode from Kansas to Utah on my eBike I ended up replacing my chain with a BMX chain. I was having trouble with the e original chain breaking on a steep grade to the west of Pueblo CO. Yes, I later found that pining a chain back together, without a quick link, is not a recommended practice.
That said, I had no trouble with the BMX chain other than I needed to adjust one guide tube for the chain (remember, I was on a recumbent trike). I will add that I had an internal geared hub (actually a NuVinci). Because of that, there were no shifter issues to deal with.
That said, I had no trouble with the BMX chain other than I needed to adjust one guide tube for the chain (remember, I was on a recumbent trike). I will add that I had an internal geared hub (actually a NuVinci). Because of that, there were no shifter issues to deal with.
08-13-23, 06:28 AM
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What I'm looking for is better materials, longer wearing materials, and frankly a wider pin and roller assembly to spread wear over a greater surface area. 7 speed chain is wider that 10 speed chain and this width is in pin and roller length, both of which are the wear areas of a chain.
Bike chains explained: structure, speeds, compatibility, chain length and more - BikeRadar
It’s worth noting that the roller widths of derailleur chains for different numbers of speeds are almost the same: 2.38mm for 5- to 8-speed chains and 2.18mm for 9-speed and above. What changes is the width of the side plates.
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