A 9-speed Shimano derailleur will work on a speed cassette if the shifter is also made by Shimano and designed for road bikes. If you want to use a 9-speed MTB derailleur with a speed cassette, you can do so via a speed road shifter or a speed friction shifter. When the shifter is triggered, it either increases or decreases the tension on the cable. In consequence, the derailleur moves outward or inward. The chain follows the path laid out for it and wraps around a different cog of the cassette.
Modern shifters are indexed. The length of each pull or discharge that happens upon clicking the shifter is pre-determined. The rider has no control over it. The main purpose of index gearing is to simplify the shifting process.
If the system is set properly, all you have to do is click the shifter and keep pedaling. This creates a problem when mixing components from group sets designed for different speeds. The sprockets cogs of speed cassettes are closer to each other than those of cassettes with fewer speeds. Therefore, speed Tiagra shifters cannot be combined with a 9-speed derailleur either. Mountain bike groupsets with 10 and more speeds have a different pull ratio than those with fewer speeds. Conclusion: A 9-speed rear derailleur can work with a speed cassette, but only if the following conditions are met:.
Ratios may also change as the number of gears changes, and there may even be pull ratio differences between different generations of the same gear model. There are, of course, exceptions, and there are lots of bodged, Sramshimpagnolo mashups that can be cajoled into working, but for the sake of simplicity, we suggest you stick to the same brand as your shifters when buying a rear derailleur. Below, we have broken down compatibility by manufacturer.
For clarity, the following information is applicable to both derailleurs and shifters. Most 8- and 9-speed Shimano mountain bike and road kit is inter-compatible because they both use the same cable pull ratio. This means that you can use an 8 -or 9-speed mountain bike derailleur with road shifters or vice versa.
Bear with us…. The only exception s to the above rules are Tiagra and the associated RS hydraulic shifters and GRX gravel mechs , which use the same cable pull ratio as current generation speed road kit.
This means you could, for example, use an speed derailleur with speed Tiagra shifters. Just for clarity, current generation , and speed Shimano road and mountain bike components are not inter-compatible with each other because they use different cable pull ratios.
SRAM has also been at the forefront of the push to ever-wider gear ranges and its newer rear derailleurs are designed to handle wider range cassettes. In un-typically Campagnolo fashion, cross-compatibility between different generations of groupsets is fairly easy to understand because there are no mountain bike groupsets yes, we know it made Euclid and a host of other off-road bits way back to contend with.
Campagnolo provides a much more thorough description of the changes here and we highly recommend you read through this guide carefully before committing to any new parts from the Italian marque.
There are also differences in the pull ratios used between different groupsets: the Ergopower shifters used by mechanical Super Record, Record and Chorus speed are not compatible with Potenza, which itself is incompatible with both Ergopower and Centaur Power-Shift systems. Apart from first-generation Dura-Ace Di2, which uses a different wiring harness, newer Shimano electronic groupsets — both road, MTB and GRX — have inter-compatible wiring and electronics.
Bridging the gap between road-going AXS groupsets and mullet builds, it offers a lower bottom gear for road and a good range for gravel riding with cassettes up to 36 teeth, but does this by altering the drivetrain alignment.
There are two common situations where there may be a large range, or spread, of gears on your bike; when using a super-wide range cassette e. In these circumstances, you will require a long cage derailleur. If you are running a 1x drivetrain with a regular-sized cassette i. If you have a traditional road double-drivetrain with a regular cassette i.
Some downhill-specific drivetrains also use short cage derailleurs e. You can work out the required tooth capacity of your bike by calculating the following:. Posted: Jun 26, at Well can I use a 10 speed derailleur on a 9 speed cassette. I see the Shimano Saint and Zee are 10 speed derailleur. And if I can use them then what do you have to do to make them work.
Normally they can't - Shimano 9spd and 10spd use different pull-ratios, so a 10spd derailleur won't work with a 9spd shifter. I do know a guy who modified his 10spd derailleur to have a different pull ratio to work with his 7spd setup.
He claims it works flawlessly, but you'd really have to know what you're doing. Posted: Jun 27, at
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