![]() ![]() This is often indicated as the maximum number of teeth that can be on the biggest cog (often referred to as low sprocket max in manuals). ![]() If you’re considering mounting a wider range cassette you should take the capacity of your rear derailleur into account.Īll derailleurs have a maximum cassette size. In order to obtain a wider range of gears, one usually changes the cassette or the chainrings on the crankset. The opposite also applies – when you shift onto the biggest cog on the rear and the biggest chainring at the front, the derailleur cage moves forwards to prevent the chain from snapping. When you shift to the smallest cog in the cassette and the smallest chainring on the front, the derailleur springs backwards in order to maintain the chain tension. The long part of the derailleur with the two little wheels is called the derailleur cage In this way the derailleur maintains the chain tension when shifting between the different cogs. The image below shows the derailleur cage. The rear derailleur has a spring which bends the derailleur cage forwards and backwards. This article will discuss the capacity of the rear derailleur. The front derailleur ensures that the chain is guided in the correct position on the chainring(s). A better quality derailleur can make shifting feel much smoother. The rear and front derailleurs control the shifting on your road or mountain bike. A wider range cassette would come in handy in this landscape What is a derailleur and how does it work? When mounting a larger cassette, however, it is important that you take the capacity of the rear derailleur into account. Doing so gives you a wider range, so that you have more shifting options on the steep climbs and can therefore get to the top a little more easily. Many cyclists choose to change their cassette or crankset when they go into the mountains. But, of course, you’ll first want make sure that your bike is up to the task, so that there aren’t any unwanted surprises. You might just be thinking of going to the mountains to get in some altimeters. ![]()
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