Best Bicycle rear derailleurs

The derailleur is the most popular type of derailleur on the market. Many different bikes use this bike gear. The function behind it is very simple. A chain always runs over two sprockets. One sprocket is attached to the rear wheel hub, the other to the crank. Depending on the size of the sprockets/chainrings, the transmission ratio of the bicycle is different. You can vary the size with the gear change. Normally, the gear rim at the rear wheel scar has seven to eleven pinions. The crank, on the other hand, has two to three chainrings. Of course the two gear levers on the handlebars should not be missing. You can use these levers to adjust the sprockets to select a higher or lower gear. The lower the gear, the harder it is to pedal the bike.

The hub gears are often found on city and touring bikes. In this bicycle rear derailleur you can see a kind of gearbox on the rear wheel, mounted directly in its hub. Normally you will get between three and eight gears. But there are also exceptions that allow twelve gears. In addition, there is the hub gear with and without backpedal. The gears are shifted via a twist grip switch on the handlebar. As soon as this is actuated, the chain moves over two chain rings via a hub gear. The advantage is that the chain cannot jump off with the hub gears

A little more exotic is the gear change. In the bottom bracket area of the bicycle you will find a kind of transmission, like in a car. The gearbox is in an oil bath. The great advantages of gear shifting are that it is very low-maintenance, effective and noiseless. As a rule you will find a gear shift on mountain bikes, but even here they are a rarity

The intended use determines which bicycle rear derailleur you should choose. For mountain bikes you should prefer the derailleur system. A derailleur with two to three front chainrings and seven to ten rear chainrings is sufficient. For Enduro and All Mountain bikes a 1 x 11 drive makes sense. Classic hub gears are not recommended. This is all the better for city and trekking bikes. So for all bicycles, where you do not ride too steep inclines. You should use a hub gear especially for driving in the city or in the country. After all, they are considered to be low-maintenance and reliable. You can actually do without a gear shift mechanism. Although it has some advantages, the price and the rarity quickly make a difference.

It must not be a mechanical bicycle switchgear, but there are also electrical alternatives. Currently they are on the advance and are inspiring more and more. For electric bicycle rear derailleurs you need suitable batteries and cables inside. Many bicycle manufacturers allow these to be elegantly integrated into the frame. The highlight of the electronic version is that you can change gears almost effortlessly. In addition, extremely precise switching operations can be made possible. Electronic bicycle rear derailleurs are usually more susceptible to this. In addition, there is the high price, because you pay considerably more for the electronics. It is also not possible to retrofit every bike.