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Shimano Tourney RD-TY300 6/7-Speed Rear Derailleur

Name: Shimano Tourney RD-TY300 6/7-Speed Rear Derailleur
Brand: Shimano

The Tourney TY300 is the derailleur on an enormous number of 7-speed e-bikes, and it is what you buy when the original gets bent by a fall or a stick. It is cheap, easy to set up, and available in a few mounting styles: a direct-mount version with a bracket (claw) for bikes without a hanger and a standard-hanger version. Before ordering, look at how your old derailleur attaches. It shifts fine for a 7-speed hub-motor bike and pairs with the stock thumb or trigger shifters; just expect to replace the cable at the same time.

7-speed hub-motor e-bikes with a bent or broken derailleurBudget like-for-like replacementsRiders who want a part that matches the stock shifter

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Key considerations

Direct-mount (with claw bracket) vs standard hanger — match your frame
6/7-speed only; use Altus for 8-speed
Check the hanger itself is not bent before blaming the derailleur
Replace the shift cable and set limit screws carefully

Pros

OEM on many e-bikes
Cheap
Simple to adjust

Considerations

Basic construction
Mounting variants cause mis-orders

Features & specifications

Speeds	6/7

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

Compatibility notes

6/7-speed Shimano-compatible shifters; choose the mount version (hanger or claw) that matches your frame

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Shimano SL-TX50 7-Speed Thumb Shifter (Right)

The SL-TX50 is the simple thumb shifter that comes on many 7-speed e-bikes, especially ones with a twist throttle on the right that leaves no room for a grip shifter. It is a right-hand, 7-click indexed shifter with an optical gear indicator, and it clamps onto a 22.2 mm bar. When the index gets sloppy or the lever breaks, this is the cheap, direct replacement. Shifters are sold with a cable, which you should install new; most shifting problems on budget e-bikes are cable friction rather than the shifter itself.

Best for: 7-speed e-bikes with a broken or worn thumb shifter · Bikes where a twist shifter conflicts with a twist throttle · Budget replacements

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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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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

View details & where to buy

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