SRAM X4 rear derailleur — 7/8/9-speed long-cage, Black, 45T chain wrap capacity

The SRAM X4 Rear Derailleur is a long-cage, 7/8/9-speed compatible derailleur engineered to deliver reliable, light-action indexing for recreational mountain and pavement riding when paired with ESP shifters.

Designed as SRAM's value-performance option, the X4 balances dependable shifting with a straightforward design that holds up on trails and streets. It uses SRAM's 1:1 shifter-to-derailleur actuation for predictable indexing and supports a wide range of gears thanks to its long cage and 45-tooth chain wrap capacity. Finished in black for a low-profile look, the X4 is meant for riders who want solid performance without premium pricing.

How does the X4 achieve smooth shifting on 7-, 8- and 9-speed setups?

The X4 uses SRAM's 1:1 actuation ratio so each click from a compatible ESP shifter produces consistent lateral movement at the derailleur. That predictable response reduces the need for frequent barrel adjustments and gives a crisp, repeatable shift feel across the cassette.

• 1:1 shifter-to-derailleur actuation for straightforward indexing
• Engineered geometry tuned for 7–9 speed chain widths
• Simple spring and pivot layout for lower maintenance

What gear range and chain capacity does the long cage support?

The long-cage X4 accommodates larger cog sizes and mixed drivetrain setups by providing a 45-tooth chain wrap capacity and compatibility with cogs up to 34 teeth. That capacity lets you run wide-range cassettes or smaller chainrings without sacrificing chain management.

• Long cage supports up to 34T large cog
• 45-tooth chain wrap capacity handles wide gear spreads
• Works well with triple or compact crank configurations

Is installation and maintenance straightforward for home mechanics?

Yes—the X4 was built with simplicity in mind, using common mounting standards and a conventional spring/pivot design that makes setup and routine maintenance approachable for home mechanics. Basic adjustments—limit screws, B-tension, and cable tension—follow standard procedures and require only common tools.

• Standard derailleur hanger mount fits most frames
• Adjustable high/low limits and B-tension screw for easy tuning
• Compatible only with SRAM ESP shifters for proper indexing

What kind of rider or use-case is the X4 best suited for?

The X4 targets recreational cyclists who want dependable, low-maintenance shifting for trail riding, commuting, or mixed-terrain weekend adventures. It gives reliable performance where durability and cost-effectiveness matter more than race-grade weight savings or ultra-precise micro-shifting.

• Commuters, entry-level mountain bikers, and casual riders
• Ideal for bikes needing a robust, long-cage derailleur
• Great choice when pairing with SRAM ESP 7/8/9-speed shifters

Who this is for: If you want a rugged, easy-to-service rear derailleur that supports wide gear ranges on 7-, 8-, or 9-speed systems and you already use or plan to use SRAM ESP shifters, the SRAM X4 long-cage offers a practical blend of performance, value, and simplicity. It’s suitable for riders who prioritize reliable everyday shifting and minimal fuss over the lightest possible componentry.