The derailleur is the most mechanically complex part of a modern drivetrain — and the one where the difference between tiers is most immediately felt. A flagship electronic rear derailleur shifts with a precision and consistency that a mechanical mid-range unit simply can't match, and the gap between wired Di2 and wireless AXS or WRL has largely closed. For most riders, the key decision is platform: Shimano Di2, SRAM AXS, or Campagnolo WRL — and that choice typically cascades through the rest of the drivetrain. The other category worth knowing about is oversized pulley wheel systems: aftermarket rear derailleur cage replacements, most notably from CeramicSpeed, that reduce drivetrain friction through larger-diameter, lower-contact-force pulley wheels.
RA Cycles carries derailleurs from Shimano, SRAM, Campagnolo, CeramicSpeed, Carbon-Ti, and Wolf Tooth. On the Shimano side, the collection covers Dura-Ace Di2, Ultegra Di2, GRX Di2, and XTR wireless across road, gravel, and mountain. SRAM representation runs from Rival AXS through Force AXS to Red AXS, including XPLR gravel variants. Campagnolo's Super Record 13 WRL and Super Record X wireless rear derailleurs round out the flagship groupset options. CeramicSpeed OSPW systems — including the 3D Titanium and limited 20th Anniversary editions — are available in both Shimano and SRAM compatibility.
If you're building or upgrading a complete drivetrain, the groupsets collection is the right starting point. For components by brand, browse Shimano components, SRAM components, or Campagnolo components. The electronic components collection covers wireless and Di2 shifting systems across all platforms, and CeramicSpeed has their full efficiency upgrade lineup in one place.
