The foundation of a fast drivetrain.

The outer chainring may get the attention, but the inner ring does much of the work.

The Carbon-Ti X-CarboRing 40T has been developed to complement the latest generation of X-CarboRing EVO outer chainrings, delivering smooth shifting, low weight and exceptional durability in a package that reflects Carbon-Ti's attention to detail.

Constructed from structural 3K carbon fibre, CNC-machined AL7075-T6 aluminium and Grade 5 titanium, the X-CarboRing combines advanced materials with precision engineering to create one of the lightest and most distinctive inner chainrings available today. Every aluminium tooth is individually machined to optimise chain engagement and shifting performance across a wide range of riding conditions.

Lightweight.

Reliable.

Deliberate.

Key Features

• Structural 3K carbon fibre body

• CNC-machined AL7075-T6 aluminium teeth

• Grade 5 titanium shifting elements

• Individually machined tooth profiles for optimised chain engagement

• Designed to work seamlessly with Carbon-Ti X-CarboRing EVO outer chainrings

• Exceptional stiffness-to-weight ratio

• Compatible with Shimano 11 & 12-speed and SRAM 11-speed drivetrains

• 100% designed and manufactured in Italy

Specifications

• Model: X-CarboRing 40 x 110 (4 Arms)

• Teeth: 40T

• BCD: 110 mm

• Mounting: 4-arm Shimano pattern

• Construction: Structural 3K carbon fibre, AL7075-T6 aluminium, Grade 5 titanium

• Weight: 45 g

• Compatible Cranksets:

  • Shimano Dura-Ace FC-9200, FC-9100 and FC-9000

  • Shimano Ultegra FC-8100, FC-8000 and FC-6800

  • SRM Origin

• Compatible Chains: Shimano 11 & 12-speed, SRAM 11-speed

• Compatible Outer Chainrings:

  • X-CarboRing EVO 54 x 110 DA9200 (4 Arms)

  • X-CarboRing EVO 54 x 110 DA9100 (4 Arms)

  • X-CarboRing EVO 54 x 110 (4 Arms)

  • Previous non-EVO 54T Carbon-Ti chainrings

• Recommended Fixing Kit: Carbon-Ti X-Fix ROAD

• Country of Manufacture: Italy

What It's For

Riders building a premium 54/40 drivetrain where every component has been selected with purpose.

Whether paired with a lightweight race bike, a performance-focused custom build or a dream specification project, the X-CarboRing 40T delivers the same attention to detail as the outer ring it supports.

Small component.

Meaningful difference.