Sram Rival AXS E1 Crank Arm Assembly

Forged Strength. AXS Integration.

The Sram Rival E1 Crank Arm Assembly is engineered to be the ultimate workhorse. By utilizing a 8-bolt interface, these arms are ready to accept everything from standard 1x and 2x chainrings to the latest integrated power meter spiders. The DUB™ (Durable Unified Bottom Bracket) spindle technology simplifies the relationship between the frame and the drivetrain, offering better moisture sealing and a single standard that fits virtually any bottom bracket shell.

Why the Rival E1 Arms are a Builder’s Favorite:

• Proven Forged Aluminum: Unlike hollow carbon, these forged alloy arms are built to handle the strikes and scrapes of gravel and CX racing while maintaining exceptional stiffness for out-of-the-saddle efforts.

• 8-Bolt Direct Mount Interface: This pro-level mounting standard provides a rock-solid connection for your chainrings or power meter. It is the same interface found on RED and Force, allowing for easy future upgrades.

• DUB™ Spindle Technology: One spindle diameter (28.99mm) to rule them all. It’s stiffer than GXP and lighter than BB30, providing a more durable bearing interface and universal frame compatibility.

• Refined E1 Aesthetics: The new polished black finish offers a premium look that punches way above its weight class, seamlessly matching the rest of the AXS wireless ecosystem.

• Modular Versatility: These arms serve as a blank canvas. Easily configure them as a 1x gravel setup with a wide-range chainring or a 2x road build for tight gear steps.

• Exceptional Value: Get the same spindle technology and mounting interface as the top-tier groupsets in a package that is incredibly durable and cost-effective.

Technical Specifications:

• Material: Forged Aluminum

• Spindle Interface: DUB™ (28.99mm)

• Chainring Mount: 8Bolt Direct Mount

• Speeds: 12Speed (AXS Compatible)

• Weight: ~710g (approximate, arms only)

• BB Compatibility: All Sram DUB™ Bottom Brackets

The Alegro Perspective: In the shop, we call the Rival E1 arms "The Foundation." If you’re building a bike like the Scott Addict Gravel and you want a drivetrain that can take a beating without stressing over carbon chips or cracks, these are the arms you want. They are incredibly stiff and the 8-bolt mount means you can add a Sram Power Spider down the road in about five minutes. It’s the smartest way to balance performance and budget in a custom build.

Rugged Construction. Endless Versatility. Build your Dream with Sram Rival.