Features: 1. Model: RD-TZ31A black rear derailleur, compatible with 6/7 speed 18/21 speed, suitable for mountain bikes and road bikes. 2. Material: Forged with high hardness aluminum alloy.The hollow weight-reduction design is adopted,and the speed change is more stable. 3. Design: Accurate gears provide light and stable shift performance and it can be adjusted slightly in multiple places to ensure accurate speed change performance. 4. Usage: Suitable for mountain bikes, station wagons, folding bikes etc. It will giveyou a better riding experience 5. Options: Two types for different mount style, direct mount or hanger mount. Please check the mount type of the original part before ordering. Specifications: Material: Aluminum alloy Color: Black Size: (Approx)(LxWxH)14x8x10cm/5.5x3.1x3.9inch Speed:6/7 speed, 18/21 speed Type: Direct Mount, Hanger Mount Package Included: 1 x Bicycle Rear Derailleur Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 0.5-2 cm differences due to manual measurement.

Robert E. (comprador verificado) –
The derailleurs works smoothly through all the gear changes.
It was very easy to change the old bent derailleur for the new one.
William M. (comprador verificado) –
Rear derailleur
Fast shipping, fit perfect, functions exactly as I expected.
Aldo R. (comprador verificado) –
This thing works. Buy it.
It may not look like much but it’s actually a great derailleur.
70 yr old rider (comprador verificado) –
Perfect replacement
Replacement derailer required on brand new unit, damaged in shipment
lucasf (comprador verificado) –
Shimano assembly line failures
Crooked bent, says Shimano
Larry Volkening (comprador verificado) –
Derailleur replacement
Great derailleur for an older model bike. It takes 7 to 9 gear set. May need a new or different chain.
John Isnor (comprador verificado) –
Excellent. Better than expected
Better than I expected. Was expecting a no name knock off but got an actual Shimano derailleur. Exact same model as the one to be replaced .