What Is The Best Mountain Bike Derailleur

A derailleur is a device that changes the gear ratio between the chain and sprockets. The derailleur is attached to the frame, and moves back and forth on a pivot that is parallel to the ground. It consists of two arms, which are connected by a pivoting link. The lower arm holds the pulley wheel, which has several different-sized teeth on it. The upper arm has a spring-loaded tensioning device that controls how far away from the frame it can move.

The best mountain bike derailleur should have high quality materials so it can withstand any type of terrain and weather conditions. It should also be able to maintain its performance over time without showing signs of wear and tear or breakage.

Which is the best Shimano rear derailleur?

1. Shimano XTR M9120 rear derailleur. The XTR range of mountain bike components from Shimano is the top-tier of off-road bicycle parts the renowned Japanese manufacturer makes, and it has a legendary reputation of superior quality, reliability and innovation. The XTR M9120 holds true to this reputation.^[1]

Which is the best gear derailleur?

Shimano Zee Freeride. A modern clutch rear derailleur for those who need Shimano 10-speed compatibility in a compact package. MicroSHIFT XCD. Shimano Deore XT Long Cage. Sunrace MZ900. SRAM GX Eagle. SRAM XX1 Eagle AXS.^[2]

How do I know what derailleur I need?

If you are replacing an existing derailleur on a bike, simply count the number of cogs on your cassette and you’re good to go. If your drivetrain’s speed is an unknown quantity, you can count the number of steps that your shifter runs through and add ‘one’ to determine the number of gears your drivetrain has.^[3]

How much does a good derailleur cost?

There can be a range of prices for replacement derailleurs, starting around $20 and going all the way up to $700.^[4]

What are the levels of Shimano derailleurs?

Shimano Tourney. Shimano Altus M2000. Shimano Acera M3000. Shimano Alivio M3100. Shimano Deore M6100, M5100, M4100. Shimano SLX M7100. Shimano Deore XT M8050. Shimano Deore XT M8100.^[5]

Which Shimano gear is best?

Shimano 105 is considered Shimano’s first performance groupset, and for many people it is the best option in combining performance, value and longevity. Ultegra is next and is very similar to Dura-Ace in terms of performance, though Dura-Ace is lighter.^[6]

How long does a rear derailleur last?

Good quality rear derailleur can last between 3 to 5 years, when unbranded or low-quality ones can last for 2 years, no matter what the durability of the rear derailleur the jockey wheel will wear after time and it can be replaced very cheaply with new ones, on the other hand, front derailleur can last almost …^[7]

Which is better Shimano Altus or acera?

Acera and Altus is positioned at the same level but based on my experience I feel Altus is much better than Acera. They create less problems and operate more precisely. Also they are lighter. They use some technology from Alivio line which you will appreciate.^[8]

Do all derailleurs fit all hangers?

There are thousands derailleur hanger types (designs) on the market. Every frame manufacturer could have different sos hanger design for each model of frame and different sos hanger for same frame but manufactured on different year.^[9]

Are all mountain bike derailleurs universal?

No, bike derailleurs are not universal. A derailleur that works with one bike may not work with another bike based on factors such as the cage length. Check the difference between the smallest and largest cogs and also the chainring size to determine the derailleur compatibility.^[10]

What’s the difference between medium and long cage derailleur?

If you are in-between the capacity ranges of the two, which is often the case with mountain bikes, then note the following: long cage derailleurs will accommodate a wider gear range and deliver a better chain line, while medium cage derailleurs are less likely to be hit by rocks on the trail.^[11]

When should I replace my bike derailleur?

Derailleurs will last almost indefinitely. The jockey wheels will wear out in time (tens of thousands of km) but the rest of the mechanism shouldn’t see significant wear. It could be that the spring will break at some point due to material fatigue, but that is also a relatively easy to replace part on most derailleurs.^[12]