Upgrade your bike's shifting performance with the microSHIFT M21 Rear Derailleur - a reliable, versatile solution for 6- and 7-speed systems. Engineered with durability and precision in mind, this derailleur features a robust combination of composite and steel materials, ensuring long-lasting performance on both road and mountain bikes. Constructed with a super short cage for quick, responsive gear changes, the M21 is compatible with 6- and 7-speed mountain and road shifters, making it ideal for a wide range of bike setups. Its compatibility with 10x1 standard mounts and a maximum sprocket size of 32 teeth allows for excellent gear range and smooth shifting even on rugged terrain or city commutes. Designed for performance and style, the sleek black finish adds a modern aesthetic to your bike. The lightweight design, weighing just 241 grams, ensures minimal impact on overall bike weight while providing reliable shifting under various riding conditions. The chain wrap capacity of 21 teeth guarantees smooth and consistent gear transitions during climbs and sprints. Whether you're upgrading an existing setup or building a new bike, the microSHIFT M21 Rear Derailleur offers a perfect blend of engineering excellence, durability, and compatibility. Search for cycling components on Markdown Market and experience the superior performance that keeps you confidently on the road or trail.
user1 (comprador verificado) –
Easy to tune, quiet, and a good fit for 7 speed drivetrains.
Good for 7 speed. It is quiet and easy to tune.
Dynamic Bicycles (comprador verificado) –
Fast, smooth shifting. Much better than Shimano at this price point.
The derailleur body and internals are made primarily of steel, including where the set screws are used to set top-bottom range. This made the setup easy and gives a sense of durability. At this price point, everything on a Shimano derailleur is plastic. This Microshift setup shifts fast and smooth and I like the compact, short cage design. Initial rides have been really enjoyable. Nice replacement for lower end Shimano derailleur.
Brutus (comprador verificado) –
Hard to believe that such an inexpensive product could be such an improvement
I purchased an old Tern Link seven speed folding bike that was a complete wreck. Among other issues, the Shimano Tourney derailleur was a blob of rust. After I wasted money derusting it, purchasing a new pivot bolt and shims for the pivot bolt, etc., I noticed that there was a lot of friction when trying to pedal. Turns out the derailleur had been bent in an accident and was at an angle to the rear wheel, inducing drag.The bike has only a singe chainring on the crank and the rear is 14-28T (28 minus 14 is only 14 tooth chain wrap capacity), so a short cage for quick shifts is ideal. Also, since the wheels on the bike are only 20″ in diameter, it is desirable to have a short cage for as much road clearance as possible. It was a bit difficult finding a short cage derailleur at a decent price, but this one is great. It seems like by the time the Revoshift hits a new number, it has already shifted into that gear.I have many bikes and the Link is the one I want to use when I travel, as it folds, cost the least and looks like a beater so hopefully will be less prone to theft. But now it is the most responsive bike I have. It’s really nice not having to wait for it to shift while negotiating traffic like with long cage derailleurs.The deraileur took around ten minutes to install. The cable feed is towards the bottom rear, so it needs more cable sleeve than the Tourney (where the feed was at the top rear). Fortunately, I had left a few extra inches of cable sleeve on the bike. Interestingly, around six inches of the the cable itself needed to be clipped off upon installation. There is very little naked cable after the sleeve enters the housing. So if you find the cable sleeve to be too short, you probably will only need a new sleeve but not a new cable.All in all, I was very happily surprised by the quality of this derailleur and the improvement it made on my bike.
DaveTheRed (comprador verificado) –
Improved ground clearance
I put these on my 20″ ebike and greatly increased the ground clearance of the derailleur over the stock unit. You will have to break the chain for these though as the rollers are not removable.
William Helenihi (comprador verificado) –
Short 7 Speed Cage
This works great. Replaced a long cage for a kids bike. Nice fit.
J Witherly (comprador verificado) –
Great value
Short of not having a clutch, it’s perfect. What a great deal. I use these on all the seven speeds I repair.
Luigi (comprador verificado) –
Fijne derailleur!
Had een derailleur nodig voor een vouwfiets (24 ” wielen), dus met een zo kort mogelijke kooi! (dit staat dus fout in de titel) Prima item, goed instelbaar, wisselen van versnelling gaat heel soepel. Kan deze aanbevelen. Wordt gebruikt voor 7 versnellingen.
Daniel Schäferling (comprador verificado) –
Super Artikel
Alles zur Zufriedenheit kann ich vorbehaltlos empfehlen
N. Earle (comprador verificado) –
Nice compact derailleur
Works great on my kid’s 20” wheel bike. Paired it with a Shimano Tourney shifter (also recommended). Nice and compact compared to the original. Easy to set up and adjust.
The most awesome Captain Awesome! (comprador verificado) –
20-in mountain bike must have!
I received this bike without a rare derailleur as a donation to our ministry.I tried several derailles on it but none was fully functional. I could get them to shift but the bee screw adjustment would not line up and eventually the derailleur would move.upon installing this, I had to break the chain but everything lined up great plus I got an extra maybe 2 in of ground clearance. microshift is really smart to build this derailleur at a great price! other short cage you railers started at $35. no wonder they get cloned. this is my new favorite derailleur! please excuse the photos!