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The Lightest Electronic Drivetrain

On a top tier bike, every gram matters. Weight savings is a consistent theme in our product development for professional racers and everyday riders. We reduced weight everywhere possible over previous generation RED eTap AXS so that SRAM RED AXS is effortlessly lightweight, representing the lightest electronic groupset yet.
When you add up all the reductions, RED AXS comes in at 2,499 grams, which is 150 grams less than previous gen RED eTap AXS. That’s more than a bag of gummy bears. How did we do it?

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In addition to adding comfort and power to the RED AXS brakes, we shaved 83 grams between the lever and caliper. When climbing on the hoods, swinging the bike side to side, it’s a weight reduction you can feel.

Crank and Chainrings

Our drivetrain product development team refined the carbon layup process of the crank arms, with a little help from the carbon experts at Zipp, resulting in a 29-gram weight savings for the crank set with no loss of stiffness
Additionally, the RED chain has been updated with our HollowPin construction. This technology is lighter and stronger than a solid pin, and cutouts in the outer plates drop the chain’s weight by 13 grams.

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Rear and Front Derailleurs

The rear derailleur received a larger pulley wheel and ceramic bearings and has shed 16 grams overall. The front derailleur is not only faster and more precise, it’s 4 grams lighter.


The Paceline X rotors combined are 8 grams lighter than the previous generation, thanks to refinements to the aluminum carrier.

Portrait of S-Works bike with SRAM RED AXS Drivetrain


Depending on how a component is configured, weights can vary. Here is an overview of exactly which elements are included in SRAM road 2x groupset weight measurements.

  • Crankset: 172.5mm crank arm length, 48/35 chainrings 
  • Cassette: 10-28T 
  • Power meter: 172.5mm crank arm length, 48/35 chainrings, coin cell battery 
  • Bottom bracket: BSA standard and appropriate spacers for 68mm shell 
  • Rear derailleur: Rear derailleur with no battery 
  • Front derailleur: Front derailleur with no battery, braze on, wedge, mounting bolt and washer 
  • Left shift-brake system:  Complete lever with coin cell battery. 950mm hose with Stealthamajig, caliper, and all hydraulic fluid. 20mm caliper bracket, caliper bracket bolts, and 15mm mounting bolts 
  • Right shift-brake system: Complete lever with coin cell battery. 1800mm hose with Stealthamajig, caliper, and all hydraulic fluid. 20mm caliper bracket, caliper bracket bolts, and 32mm mounting bolts 
  • Chain: 114 links 
  • Rotors: 2 160mm Centerlock rotors and SRAM lockrings  
  • Batteries: 2 batteries 

Effortless performance. Effortless perfection.