★ Key Takeaways
2 Answers. Show Activity on This Post. a Derailleur for Your Mountain Bike Should Match the Specifications on the Original Derailleur. That Is, While It Doesn't Need to Be the Same Model of Derailleur, It Does Need to Be the Same Brand, in Almost Every Case.
Is does Any Derailleur Fit Any Bike a hot topic right now? Read the pros and cons in our dedicated article.
2 Answers. Show Activity on This Post. a Derailleur for Your Mountain Bike Should Match the Specifications on the Original Derailleur. That Is, While It Doesn't Need to Be the Same Model of Derailleur, It Does Need to Be the Same Brand, in Almost Every Case.
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