Shimano s low normal derailleurs on which it does the opposite.
New derailleur cable.
The cable system is a common place to find issues that cause poor shifting.
If the derailleur hanger is damaged the new derailleur will never shift like it should.
If the shifter is mounted on the handlebars you need the first run of cable to be long enough to allow the handlebars to turn fully without pulling on the derailleur cable.
On most derailleurs when the shift lever pulls on the cable the derailleur moves up the cassette to a lower gear.
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Make sure that the hanger is visibly straight has no stress marks or nicks and that the threads are not damaged.
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Dirt and grit can work their way inside the housing.
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.
Friction along the shift cable prevents consistent movement of the derailleur as the cable is pulled and released at the shifter.
Mount new derailleur before installing the new derailleur make sure the current derailleur hanger is in good shape.
Hangers are unique to your frame and it is a good idea to buy a spare when you buy a new frame.
You don t have to be a mechanic to replace the rear derailleur cable.
We ll show you how to perform cable replacement using a shimano equipped road bike.