What is the difference between these derailleurs. I want to change my derailleur and don’t know which one is better.

  • What do you have now? Is it 9 speed? What are you looking for in a new derailleur?
    – David D
    Commented May 29, 2019 at 23:59
  • I have a 7 speed ty-300 good shifting and durability
    – Ss S
    Commented May 31, 2019 at 0:33

2 Answers 2


If you want to know the exact differences, Shimano does provide very detailed specs on their Manuals & Technical Documents site. (Click 'Technical Documents' on the left hand side to get to line up, specs and compatibility pages.)

Specification are ordered by use (MTB, road, ...) and component. If you go to the MTB rear derailleur page you can pick derailleurs to compare.


In increasing quality (and expense) is Altus, Acera Alivio.

In real world conditions, there is not a lot of difference between each set. Experienced riders will probably notice that Alivio is better than Altus, but other factors such as shifters, cables and drive train wear make a larger difference

General advice I give to people is buy the right component - i.e. that matches the number of speeds and cage length - that's on the largest discount but still in your budget.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.