Best Rear Bike Derailleurs of 2026

"I found the Shimano RD-TY500 to be reliable and exceptionally smooth for my 7-speed bike. Installing it was straightforward, and the shifting is now crisp, fast, and consistent. For anyone looking to upgrade on a budget, I highly recommend it."

"I paired this derailleur with a new chain and freewheel on my old Schwinn. The installation and adjustment process was simple, and now shifting is accurate and responsive. It brought new life to my vintage bike."

"While the derailleur works well and feels sturdy, I wish it included clearer installation instructions. As a novice, it took me some time to get everything tuned right, but now my son's bike is performing reliably, even with rough use."

"After switching from the XO1, I found this derailleur performs just as well, even though it's a bit heavier. The shifting is the best I've ever had on a mountain bike, and I'm glad I saved some money by choosing this model."

"I upgraded from the SX, and now my bike shifts perfectly. The performance boost was immediately noticeable, and the value for the price is outstanding."

"Replacing my old derailleur with the GX was a night and day difference. Shifting became crisp and smooth even under load, and the annoying chain slap disappeared. I highly recommend this as an upgrade from SX; it's made my bike run better than ever."

"I was impressed with the easy installation and perfect fit of this derailleur. The replacement went smoothly, and after some quick adjustments, I was back on the road with smooth shifting."

"The build quality feels robust and the instructions in English were a nice touch. It worked flawlessly with my trigger shifters on my 7-speed bike."

"After bending my original derailleur, I installed this one on my Lectric XP 3.0 and it worked perfectly. It was a great replacement and a breeze to set up."

"I was able to replace a broken gear quickly and at a good price for a charity bike. Installation was straightforward, especially if you know a bit about bikes. The only tricky part was opening the chain, but everything needed for the repair was included. The bike works perfectly now and the child is thrilled!"

"This derailleur was a perfect fit—the screw holes matched up exactly and the chain assembly went through just like it should. Install was a breeze."

"After the original derailleur broke, I decided to get the same model to replace it. However, it broke again after only a few rides, exactly like the first time. The plastic parts just aren't durable enough, and it nearly caused an accident. Next time, I’ll invest in a full metal version."

"I found the installation process to be quick and straightforward, and it was an exact fit for my 8-speed REI gravel bike with a Shimano Altus Derailleur. I really liked that the cage could be opened to insert the chain without messing with a link. Overall, for the price, this is a solid choice for casual riders."

"This derailleur was simple to set up on my 7/8 speed bike, and shifting is smooth and precise. It fits direct mount and was up and running in just minutes. In my experience, it’s a great value for the price."

"I needed a replacement for my teenager's main ride, and this product was an upgrade over the original. It arrived quickly and got my kid back on the road right away, which was a huge plus."

"I upgraded my mountain bike drivetrain and was seriously impressed by the effortless installation and super smooth shifting this derailleur delivered. The clutch feature keeps my chain secure—I haven’t had a single chain slap or drop since adding it. I did have to loosen the clutch out of the box, but once set, it worked flawlessly. Overall, it’s been a fantastic upgrade."

"I installed this on my older bike and was surprised at how simple the process was. The derailleur fit right into place, and once I adjusted the high/low screws, it held tension across all gears with no issues. It’s definitely easier to set up than models I’ve used before."

"This derailleur works great with my 1x drivetrain and shifts perfectly once set up correctly. Just a heads-up: it maxes out at a 46t cassette, so you’ll want to double-check compatibility before buying. After switching to the right cassette, everything ran smoothly and I’m happy with the performance."

"I needed an exact replacement for a damaged derailleur on my Walmart multi-speed bike, and this one fit perfectly. Even with my limited bike knowledge, it worked just as expected."

"Installing this derailleur was straightforward—the only tricky part was dealing with my old, rusty chain. If you’re new to this, I suggest taking a photo of your chain routing first. Otherwise, the adjustments were easy and it’s been holding up well on my daily commuter bike, especially for the price."

"The product itself is of good quality and works fine, though I wish there had been more detailed instructions included. Still, I’m happy with the performance for the price."

"I found the installation to be quick and simple, only needing to remove a wheel and bend the bracket—no chain tool required. The shifting is just as good as the original part."

"My son's bike needed a new derailleur, and this one matched up perfectly. For the price, it's a solid replacement, though the main mounting part is plastic. If you’re not familiar with derailleur adjustments, just look up a quick video."

"This replacement derailleur fixed my bike's skipping gear issue right away. The installation was a bit tricky and time-consuming due to the lower jockey wheel, but after some effort, everything fit and performed as expected. The overall quality isn’t quite as high as the original, but it gets the job done."

"I've been using this derailleur for four years now as part of my single-speed to 7-speed conversion project. I couldn't be happier—shifting is incredibly smooth, and it fit perfectly even though my bike didn't have a built-in derailleur mount. Highly recommended!"

"After endless repairs on a second-hand bike, I needed a derailleur that would fit a hook mount and solve clearance issues. This one was easy to install, feels sturdy, and shifts cleanly. For the price, it's a solid upgrade—even if I wish I'd picked a different bike to begin with."

"The installation process was straightforward, but getting the derailleur fine-tuned took some time. Once I adjusted the limit screws, though, it worked flawlessly across all gears. It just needed a bit of patience to get it right."

"I upgraded my Mongoose Malus with the Bfang setup, and this derailleur proved to be a notable improvement."

"The installation was straightforward, and it fit my bike perfectly. I was impressed by how smoothly it shifts and found the value to be excellent."

"After my son damaged his old derailleur, I installed this one on his bike. It shifts flawlessly, and we've had zero issues so far."