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A properly functioning derailleur can make a huge difference to how shifting feels on your road bike or mountain bike. Upgrading you front or rear derailleur can create a smoother shifting experience or a wider shifting range.

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Shimano 105 5701 Derailleur 10 Speed Upgrade Kit

From 97.70
RRP 127.20
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SRAM GX Eagle 12 Speed Rear Derailleur

RRP 120.30

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When you're planning to buy and replace a derailleur, a lot of questions may come up. Below are the most frequently asked questions and their answers. So you can buy the right derailleur without any problems.

Which cassettes are suitable for this derailleur?

This depends on several factors. Mostly, it depends on your derailleur's capacity. In this blog you can read all about derailleurs, long cages and short cages.

My groupset brand does not match the brand of the derailleur, can I buy this derailleur?

When it comes to the derailleur, it's all about what brand the shifters are. For example, if you have Shimano shifters and want to fit a Shimano derailleur, there should be no problem. But with another brand of shifters, like SRAM or Campagnolo, you will not be able to use a Shimano derailleur. This is because each brand uses a different technology in the communication between the shifter and the derailleur. This applies to both the front and rear derailleur.

Should the derailleur be of the same speed as the rest of the groupset?

We can be brief about this, yes. If your groupset is 12 speed, you will need to buy a 12 speed derailleur. If your bike is spec'd with an 11 speed groupset you need an 11 speed derailleur. The same goes for 10 speed derailleurs. This applies to any number of gears.

Find out more on our Blog

Derailleur capacity - what is the max my derailleur can handle? - Techcenter

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Derailleur adjustment - How can I get my derailleur shifting smoothly again? [How-to]

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