Is it time to upgrade or replace your derailleur? Do you sit awake at night worrying about what a tooth capacity is? Or have you ever simply wanted to know absolutely everything there is to know about buying a rear derailleur? If so, you’ve come to the right place.
While we certainly don’t recommend you break out this hot derailleur chat at your next party, this is undoubtedly useful information if you’re looking to buy or upgrade a rear derailleur.
We must stress that this article only covers rear derailleurs because including front derailleurs would make this guide far too unwieldy. Plus, if you’re to believe SRAM, the front derailleur is dead anyway.
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Which brand of derailleur should I buy?
As a general rule of thumb, it’s best not to mix and match drivetrain components from different brands. While things like cranks, chains and cassettes are largely interchangeable between brands, shifters and derailleurs generally speaking aren’t.
In brief, Shimano, SRAM and Campagnolo all use different cable pull ratios (the amount that a derailleur moves for every millimetre of cable pulled through by the shifter), and mixing parts will result in very poor shifting.
How many gears does my bike have?
Derailleur compatibility explained
Shimano derailleur compatibility
- All 11-speed Shimano road components are inter-compatible — you could for example use a Dura-Ace 9000 derailleur with a pair of 105 5800 shifters
- All 10-speed road components are inter-compatible — you could for example use an old Ultegra 6600 derailleur with new, Tiagra 4800 shifters
- Current 9-speed road components are backwards compatible with older 9-speed road and mountain bike components, excluding the aforementioned exception
- All 11-speed Shimano mountain bike components are interchangeable — you could for example use a XTR M9000 derailleur with a pair of SLX M7000 shifters
- All 10-speed Shimano mountain bike components are also interchangeable — you could for example use an old, 10-speed XTR M986 rear derailleur with new, Deore M610 shifters
- Current 9-speed Shimano mountain bike components are compatible with older 9-speed road and mountain bike components, excluding the aforementioned exception
SRAM derailleur compatibility
- 7-/8-/9-speed SRAM components are all inter-compatible, regardless of whether they are road or mountain bike parts
- 10-speed SRAM components are inter-compatible, regardless of whether they are road or mountain bike parts — for example you could run road shifters with a mountain bike rear derailleur
- 10- and 11-speed SRAM mountain bike components are not inter-compatible
- 10- and 11-speed SRAM road components are inter-compatible — meaning you could run a 10-speed, SRAM Red rear derailleur with a pair of SRAM 22 shifters
Campagnolo derailleur compatibility
- All 8- and 9-speed Campagnolo groupsets before mid-2001 used the same pull ratio and are compatible with each other. This generation of parts is often referred to as ‘Campy old’
- After mid-2001, Campagnolo started using a revised pull ratio for its newer 9-speed kit, and these and all 10- (and 11-speed) groupsets from this period are inter-compatible — for example you could run an Athena derailleur with Record shifters
What cage length derailleur should I buy?
Derailleur cage length quick guide
Derailleur tooth capacity explained
Clutch derailleurs explained
What do I get with a more expensive derailleur?
Weight
Longevity
Finish
You can read more at BikeRadar.com
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