Frisco E-Bike
Mountain bike drivetrain components

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Cassettes · Shimano

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.

9-speed Shimano-equipped e-bikesRiders who want a lower climbing gear than stockDrivetrain refreshes with a new chain

Current price and availability are shown on Amazon.

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Key considerations

  • 9-speed only; check your shifter
  • Freehub required (HG spline)
  • Derailleur must handle a 34T cog; most modern ones do
  • Replace the chain at the same time

Pros

  • Wide range
  • Reliable shifting
  • Good value

Considerations

  • Heavier than higher-tier cassettes
  • Needs tools

Features & specifications

Speeds9
Range11-34T

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

Compatibility notes

  • Shimano HG freehub bodies and 9-speed shifters/derailleurs rated for a 34T cog

Keep it running

Replacement parts

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

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Mountain bike drivetrain components
E-Bike Chains

KMC e8 E-Bike Chain (8-Speed)

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.

Best for: Mid-drive e-bikes with 8-speed cassettes · BBS02/BBSHD conversions · Heavy riders who break standard chains

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Close-up of bicycle gears and chain
Cassettes

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.

Best for: 7-speed e-bikes with a Shimano-style freehub · Replacing a worn cassette alongside a new chain · Budget drivetrain refreshes

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Hands-on bike repair work
Derailleurs

Shimano Altus RD-M310 7/8-Speed Rear Derailleur

The Altus M310 is a step up from Tourney and the common derailleur on 8-speed e-bikes; it also works with 7-speed shifters, which makes it a popular upgrade when a TY300 dies. It mounts to a standard derailleur hanger (no claw version), handles up to a 34T cog, and shifts noticeably crisper than Tourney. It is still inexpensive. If your bike uses a direct-mount claw bracket, you will need an adapter or to stay with Tourney. Replace the shift cable at the same time and check the hanger alignment.

Best for: 8-speed e-bikes needing a replacement derailleur · 7-speed bikes with a standard hanger that want crisper shifting · Riders running a 34T low cog

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