SRAM RED AXS E1 12-Speed Medium Cage 36t Max Black Rear Derailleur

The SRAM RED AXS E1 is the current-generation wireless RED road rear derailleur for 1x or 2x drivetrains with cassettes from 10-28t to 10-36t. SRAM lists it as 16 g lighter than the previous generation, with larger X-Sync pulleys and an Orbit fluid damper.

It mounts to a standard hanger, pairs with RED AXS shifters, and uses existing AXS batteries, which are sold separately. Listed weight is 262 g.

Who It's For

• Road and gravel riders building or upgrading a RED AXS E1 group.
• Riders who want one derailleur that covers 1x or 2x setups up to 36t.
• Consider a RED XPLR derailleur for 1x gravel cassettes above 36t.

What to Look For

• Battery: Not included; uses any SRAM AXS battery.
• Cassette: 10-28t up to 10-36t.
• Generation: E1. Check that shifters and the rest of the group are AXS.

Key Features

Orbit chain management. A fluid damper that keeps the chain quiet and secure over rough roads.

Larger X-Sync pulleys. Reduce chain articulation for better drivetrain efficiency.

1x or 2x. The same derailleur works on single or double RED drivetrains.

Lighter. SRAM lists it 16 g lighter than the previous RED AXS derailleur.

Rider Intent Summary

• Biggest strengths: Lightest RED road derailleur yet, per SRAM; 1x or 2x; 36t range.
• Tradeoffs: Battery sold separately; 36t maximum cog.
• What makes it different: One derailleur covering road and light gravel gearing within the RED E1 group.

Victory's Take

We think RED AXS E1 is the most refined road derailleur SRAM makes right now. Victory Bicycle Studio can install, pair and tune it with your RED group.

Specifications

• Brand: SRAM
• Model: RED AXS (E1)
• Drivetrain speeds: 12
• Largest cog: 36t
• Cassette range: 10-28t to 10-36t
• Cage length: Medium
• Mount type: 10x1 standard
• Shifter compatibility: SRAM eTap AXS
• Chain management: Orbit fluid damper
• Battery: Not included
• Color: Black
• Weight: 262 g
• Part number: 00.7518.184.000