Medium cage derailleurs are, as you can tell, in between a short and long cage derailleur. Moreover, the size of a short cage makes it lightweight and aerodynamic, which is ideal for road cycling. Road bikes also have a smaller gearing range in the cassette. Short cage derailleurs can be found on road bikes that have a double or single chainring. Additionally, they can be used in pretty much all bikes without any issues in gear changing. Any other bike with triple chainrings at the front may also feature a long cage. Long cage derailleurs are mostly used in mountain bikes which have a large range between the cogs in the rear cassette. The bigger the range between the extreme positions of a bike’s gear, the longer the cage needs to be to pick up the extra slack. The reason why there are different cage lengths is that the number and range of gears vary a lot from one kind of bike to another. But a short cage derailleur is lighter and has less of a chance of suffering impacts. Naturally, a longer cage can take up more slack in the chain. As stated, there are long cages, medium cages, and short cages. The cage length of a derailleur is the distance between the two small idler gears known as the tension pulley (T-pulley) and the gear pulley (G-pulley). Rear derailleur Derailleur cage length: long, medium, and short
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