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KMC e8 E-Bike Chain (8-Speed)

Name: KMC e8 E-Bike Chain (8-Speed)
Brand: KMC

KMC's e-series chains are built for the extra torque a mid-drive motor puts through the drivetrain, with thicker, stronger plates and pins than a standard chain of the same speed. The e8 is the 8-speed version and also works on most 7-speed systems with 7-speed cog spacing. If you have a Bafang BBS02, BBSHD or a production mid-drive bike (Bosch, Shimano STEPS, Bafang M-series) with an 8-speed cassette, this is the chain to buy when the old one measures worn. It will not make a hub-motor bike faster, but it will not hurt either.

Mid-drive e-bikes with 8-speed cassettesBBS02/BBSHD conversionsHeavy riders who break standard chains

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Key considerations

8-speed cog spacing; KMC sells e9, e10, e11 for other counts
Usually ships long — size to your drivetrain
Mid-drive riders: shift under light load to extend life
Check stretch every few hundred miles

Pros

E-bike-rated strength
Quick link included
Good corrosion resistance

Considerations

Pricier than a standard chain
Overkill for light hub-motor use

Features & specifications

Speeds	8

Specifications are manufacturer-published figures or our own notes; confirm on the current listing before purchase.

Compatibility notes

8-speed drivetrains (and most 7-speed); rated for mid-drive motor torque

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Similar alternatives

All e-bike chains →

E-Bike MotorsFeatured

Bafang BBS02B 48V 750W Mid-Drive Conversion Kit

The BBS02B is the mid-drive kit that turned thousands of ordinary bikes into e-bikes. It replaces the bottom bracket with a motor unit that drives the chainring, so it uses your gears and climbs far better than a hub motor of the same wattage. Kits bundle the motor, a chainring, cranks, display, throttle, brake sensors or cutoff levers, and a speed sensor; the battery is sold separately. Installation is a weekend job with a few special tools. It is not quiet under hard load and it is hard on chains, but it is the most proven budget mid-drive there is.

Best for: Converting a rigid or hardtail bike with a standard 68–73 mm threaded bottom bracket · Hilly commutes where a hub motor struggles · Riders who want gear-assisted climbing rather than raw throttle power

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Mid-Drive Components

Lekkie Bling Ring 42T Chainring for Bafang BBS02/BBSHD

The stock Bafang chainring sits far outboard, which gives many BBS02 and BBSHD builds a poor chainline and extra chain wear. Lekkie's Bling Ring is the popular fix: a machined aluminum narrow-wide chainring that moves the teeth inboard to improve chainline and holds the chain better off-road. It comes in several tooth counts; 42T is a common all-round choice that lowers gearing a bit from the stock 46T for better climbing. Make sure you buy the version for your motor — BBS02 and BBSHD use different spiders.

Best for: BBS02B and BBSHD riders chasing a straighter chainline · Hilly terrain where a smaller ring helps · Anyone replacing a worn stock steel ring

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E-Bike Chains

KMC Z7 Chain (6/7/8-Speed)

The KMC Z7 (formerly labeled Z51) is the standard replacement chain for 6-, 7- and 8-speed drivetrains, which covers most hub-motor e-bikes. It is an inexpensive chain that includes a reusable quick link, so installation needs only a chain breaker to size it. On an e-bike the chain carries only your pedaling load with a hub motor, so a basic chain like this lasts well; with a mid-drive you should step up to an e-bike-rated chain. Measure your old chain for length and replace the freewheel if the old chain was badly worn.

Best for: 7-speed hub-motor e-bikes · Budget drivetrain refreshes · Riders who want a quick-link install

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