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RD-TY21B 6/7 Speed Rear Derailleur - Direct/Hanger Mount for Mountain Bike, Commuter Bike, Cruiser Bikes

4.9 (2) Write Review
Free shipping on orders over $29.99

$17.99

$ 8 .99 $8.99

In Stock

1.Size:Black-rd-ty21b-direct Mount


About this item

  • MODEL: RD-TY21B; Bike rear derailleur is compatible with 6/7 speed most kinds of bikes
  • PERFORMANCE: Durable aluminum alloy material and excellent shifting performance ensure safe and stable riding
  • WIDE APPLICATION: This bicycle transmission is Suitable for MTB, mountain bikes, commuter bike, cruiser bike, folding bike etc.
  • NOTE: The bike rear derailleur is direct mount, not hanger mount .Please check the mount type of the original part before purchasing. If you have any questions, please feel free to contact us, we will provide you with professional services.



Laplante Perkins
Reviewed in the United States on June 26, 2025
Entry level derailleur that most know the name of by now so for $17 it is entirely reasonable. Direct mount and silver just as described well everything was accurately described. They state they will answer any questions which I did not contact them so I can not attest to that but the product is exactly what you expect to get when purchasing based on the product page alone. No damage upon arrival and was packaged properly. Would love to see this seller offer more bike parts.
Why Not?
Reviewed in the United States on June 25, 2025
This looks and feels just like the OEM model. We got this to upgrade a bike from a cheap rusty generic, and this one fit perfectly in its place. It comes with some well-greased gears and feels very sturdy, like it'll last a while.