The SRAM X4 7/8/9-Speed Long Cage Rear Derailleur (Black) is an entry-to-mid tier mechanical mountain bike derailleur cataloged under SRAM model ID RD-X4-A1. Renowned for its reliability and cost-effectiveness, it serves as an excellent replacement part for recreational trail, trekking, and commuter bikes. Featuring an upgraded low-profile chassis and a wider pivot design compared to the lower-tier X3, it ensures cleaner shifting stiffness for a smoother riding experience.

Product Specifications & Features

• 1:1 Actuation Ratio:
  Built with SRAM's signature 1:1 Actuation Shifting Technology, this derailleur moves the exact same distance for every millimeter of cable pulled. This ensures crisp, forgiving alignment that resists cable stretch, mud, and trail debris.
• Multi-Speed Adaptability:
  Universally compatible with 7-speed, 8-speed, or 9-speed gear systems, depending on the index speed of the matching SRAM shifter.
• Long Cage Geometry:
  The extended cage design offers a generous 45-tooth total chain wrap capacity, accommodating up to a 22T front chainring difference. Perfect for triple (3x) or double (2x) multi-chainring cranksets.
• Cassette Tolerances:
  Designed to handle cassettes with a minimum cog of 11T and a maximum cog of 34T.
• Structural Materials:
  Constructed with a durable 6061 alloy b-knuckle, a high-stiffness steel outer cage, and a lightweight Grilon composite inner cage. It operates on replaceable steel pulley bearings and weighs approximately 280 grams.
• Di.R.T (Direct Route Technology):
  The shift cable routes directly into the cable anchor, eliminating traditional, loop-heavy rear housing bends. This reduces friction and protects cables from trail snags.

This derailleur combines durability, efficiency, and versatility, making it a trusted choice for riders looking to enhance their biking experience.