Frisco E-Bike
Close-up of bicycle gears and chain

Representative photo. Product photos and current options are on the Amazon listing.

Cassettes · Shimano

Shimano CS-HG200-7 7-Speed Cassette 12-32T

Many 7-speed e-bikes with a cassette freehub (rather than a thread-on freewheel) use this exact Shimano part or a close equivalent, and it is the cheapest genuine Shimano replacement. The 12-32 range gives a usable low gear for assisted climbing and a top gear that will not spin out at class-2 speeds. Cassettes wear together with chains, so if your chain is stretched, replace both. Before ordering, confirm that your rear hub is a freehub with a lockring and splines; if your cogs thread onto the hub, you need a freewheel instead.

7-speed e-bikes with a Shimano-style freehubReplacing a worn cassette alongside a new chainBudget drivetrain refreshes

Current price and availability are shown on Amazon.

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Key considerations

  • Freehub vs freewheel — look for a lockring on the outer cog
  • 7-speed cassettes usually need a spacer on 8/9/10-speed freehubs
  • Replace the chain at the same time
  • Needs a cassette lockring tool and chain whip

Pros

  • Genuine Shimano at a low price
  • Common gearing
  • Widely stocked

Considerations

  • Basic finish, corrodes if neglected
  • Tools required

Features & specifications

Speeds7
Range12-32T

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

Compatibility notes

  • Shimano-compatible (HG) freehub bodies; 7-speed drivetrains — not for thread-on freewheel hubs

Keep it running

Replacement parts

Confirm fitment on your bike before ordering — see each part’s compatibility notes.

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Mechanic working on bike components
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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Mountain bike drivetrain components
Cassettes

Shimano CS-HG400-9 9-Speed Cassette 11-34T

Mid-priced e-bikes frequently ship with a 9-speed Shimano Alivio or Acera drivetrain, and the HG400-9 in 11-34 is the standard replacement cassette. The 34-tooth low gear is a real help on hills if you prefer to keep the assist low, and the 11-tooth top is enough for fast flats. It is an inexpensive, durable cassette and the right partner for an e-bike-rated 9-speed chain. As with any cassette swap, confirm you have a freehub body, and budget for a lockring tool and chain whip if you do not have them.

Best for: 9-speed Shimano-equipped e-bikes · Riders who want a lower climbing gear than stock · Drivetrain refreshes with a new chain

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Hands-on bike repair work
FreewheelsFeatured

Shimano MF-TZ500 7-Speed Freewheel 14-28T

Most rear hub-motor e-bikes use a thread-on freewheel rather than a cassette, and the 7-speed Shimano MF-TZ500 (successor to the TZ-31) is the one that comes on a huge share of them. It screws onto the motor's threaded boss and comes off with a standard Shimano freewheel remover. The 14-28 range is conservative: fine for flat commuting and assisted riding, limiting if you want to pedal fast downhill. When the freewheel starts skipping or the pawls stick, replacing it is a cheap twenty-minute job if you have the tool.

Best for: 7-speed hub-motor e-bikes with a thread-on freewheel · Fixing a skipping or sticky freewheel · Like-for-like replacements

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