ethirteen UL Chainring

ethirteen UL Chainring Info

UL Chainring from ethirteen is purpose-built for riders who prioritize efficiency, low weight, and clean drivetrain performance in XC and gravel applications. Designed as the lightest 1x XC/Gravel chainring in ethirteen’s lineup, the UL ring takes the proven SL Chainring platform and refines it with strategic machining and a reworked arm profile to shed weight without compromising real-world ride reliability.

This careful material reduction delivers meaningful weight savings while retaining enough impact strength for aggressive racing and fast-paced riding. The UL Chainring is optimized with a -5mm Boost offset, making it the correct choice for XCX Race MTB cranks on Boost-spaced frames. It’s also the designated option for all XCX Gravel crank applications, where low mass and efficient power transfer matter most.

UL Chainring Specs at a Glance

• Application: 1x XC and Gravel drivetrains.
• Design Focus: Ultra-lightweight construction with minimal strength compromise.
• Offset: -5mm Boost offset.
• Crank Compatibility: XCX Race MTB cranks (Boost only).
• Gravel Use: Required chainring for all XCX Gravel crank setups.
• Non-Boost Guidance: Use SL Chainrings for non-Boost (142mm) bikes.
• Helix Compatibility: Not compatible with Helix cranks.

Design Benefits

1. Maximum Weight Savings: Optimized machining removes excess material where it’s not needed.
2. Race-Tuned Geometry: Boost-specific offset ensures proper chainline on modern XC frames.
3. Application-Specific Fit: Clearly defined compatibility prevents drivetrain compromises.

Final Take

The UL Chainring is aimed squarely at riders chasing marginal gains—racers and gravel specialists who care about every gram. When paired with the correct XCX crank and frame spacing, it delivers an exceptionally light, efficient 1x solution that reflects ethirteen’s focus on performance-driven design.