The ROTOR Aero Round Ring outer chainring with 55 teeth is designed for road and triathlon drivetrains with a compatible BCD-110x4 mount. Its round chainring shape keeps the gear ratio constant throughout the crank rotation. The closed aero design adds a smooth, solid surface.

The chainring is designed for a 2x drivetrain and can be paired with a 42- or 44-tooth inner chainring when suitably matched. A compatible 4-arm spider and a chainring combination compatible with the crank and shifting system are required.

Top features at a glance:

• 55-tooth outer chainring: For suitably matched 2x road bike drivetrains.
• Round aero design: Closed construction with a constant gear ratio.
• BCD 110x4: Mount for suitable 4-arm road spiders and cranks.

Technical specifications:

• Manufacturer: ROTOR
• Model: Aero Round Ring
• Product type: Outer chainring
• Intended use: Road cycling / road / triathlon / time trial
• Number of teeth: 55 teeth
• Intended inner chainrings: 42 or 44 teeth with a suitable combination
• Drivetrain: 2x
• Speeds: 9-/10-/11-speed according to the available product data
• Mount: BCD 110x4 mm (4-arm)
• Chainring shape: Round
• Design: Aero
• Material: Aluminum 7075
• Color: Black

Compatible with:

• Suitable ROTOR road cranks and spiders with a compatible BCD-110x4 mount, such as corresponding ALDHU or INspider systems
• Matched 2x drivetrains with a suitable 42- or 44-tooth inner chainring

Important: The exact shape and position of the mounting holes must match the crank or spider in question. An identical bolt circle diameter alone does not confirm compatibility with Shimano or other 4-arm cranks.

Scope of delivery:

• 1 × ROTOR Aero Round Ring Outer Chainring, 55 Teeth, Black
• Inner chainring, crankset, and mounting bolts are not included.
• Packaging: Original packaging

Manufacturer part number: C01-518-06020-0 | EAN: 8434366018263

For compatible 2-speed road bike drivetrains with a 55-tooth outer chainring and BCD 110x4 mount.