10 Best 7 Speed Derailleur 2025 in the United States

The Huazu Rear Derailleur for RD-TZ31-A is designed for 6 and 7-speed mountain bicycles, making it a versatile choice for various bike types, including mountain, road, and folding bicycles. One of its main strengths is its compatibility with GS SIS Index Shifting drivetrains, ensuring smooth and precise gear changes. It features a durable build, combining aluminum alloy and plastic, which contributes to both its stability and longevity.

At 0.28 kilograms, it is relatively lightweight, which can be advantageous for maintaining bike efficiency without adding unnecessary weight. Additionally, its direct mount design requires checking compatibility with your bike frame's hook, which might be a minor inconvenience for some users but ensures a secure fit if compatible. It is worth noting that the derailleur has a total capacity of 34T, accommodating a largest sprocket of 28T and a smallest sprocket of 14T, with a front chain wheel tooth difference of 20T, making it suitable for varied terrains.

On the downside, the requirement to ensure the correct mount type can be an extra step for some users, and the material blend, while durable, might not match the robustness of higher-end all-metal derailleurs. This product is ideal for casual bikers or those looking for a reliable and cost-effective derailleur for their 6 or 7-speed bikes.

The Shimano RDM310DL Altus GS 7/8-speed Rear Derailleur is a solid choice for those looking to upgrade or replace their bike’s rear derailleur. It is compatible with both Shimano and SRAM 8-speed drivetrains, making it quite versatile. The long cage length is beneficial as it allows for a wider gear range, which can provide smoother shifting over varied terrain.

Made from alloy steel, it is durable and should withstand regular use, which is great for everyday cyclists or those who enjoy weekend rides. Weighing 326 grams, it is reasonably lightweight, though there are lighter options available in the market. The shifting performance is traditional top-normal, which is standard and should be familiar to most users, ensuring consistent and reliable shifting.

While the black color is sleek and should match most bikes, the design and look are fairly basic. This derailleur is a dependable, reasonably priced option that performs well for everyday cycling needs.

The Shimano Acera RD-M3020-SGS Rear Derailleur is a reliable choice for 7-speed and 8-speed bike setups, offering versatile performance and wide compatibility. It features a long cage (SGS) which allows for better chain wrap capacity of 45 teeth, making it suitable for a range of gear ratios. This can be particularly advantageous for riders who tackle varied terrains, as it maintains smooth shifting performance across the gear range thanks to the Double Servo mechanism that optimizes the derailleur's movement path.

Made from aluminum, the derailleur is both robust and lightweight at 0.39 kilograms, contributing to bike weight savings without compromising durability. The black color gives it a sleek appearance that can match most bike styles. It is important to consider that as a 7/8-speed derailleur, it may not be suitable for bikes with higher speed ranges. Additionally, while the long cage is beneficial for chain wrap, it might be more prone to damage if riding in rough conditions compared to shorter cage models.

The Shimano Acera RD-M3020-SGS is an excellent choice for casual to intermediate riders seeking a durable, high-performing derailleur for their 7 or 8-speed setups.