110 BCD Asymmetric to 144 BCD Chainring Adapter

Designed to bridge the gap between modern road cranksets and standard 144 BCD track chainrings. Originally developed in-house during a fixed gear winter training build, this adapter allows Shimano and compatible road cranks to be used with full-size track rings—without compromising chainline, stiffness, or fit.

Precision CNC-machined from aerospace-grade 6061-T5 aluminum and held to tight tolerances, it's built with the same engineering principles found in every RPM Components product: reliability, simplicity, and performance backed by real-world application.

Converts 110 BCD asymmetric (Shimano 4-bolt) to standard 144 BCD

Optimized chainline for track setups

Aerospace-grade 6061-T6 aluminum

"Stone Black" Satin Powder coat

Compatible Cranksets:

Shimano R8000 / R8100 (Ultegra)

Shimano R9100 / R9200 (Dura-Ace)

SRM Shimano-pattern 4-bolt power meters

Quarq DFour and other 110x4 Quarq spiders

Verve InfoCrank (110x4 asymmetric)

Rotor 110x4 asymmetric cranksets

FSA asymmetric 4-bolt models

Note: This adapter is designed for use with all cranksets that follow Shimano’s asymmetric 110 BCD 4-bolt pattern. If you’re unsure about compatibility, contact us.

Note 2: Some road bikes will only have clearance up to a 60-tooth chainring so be sure to check compatibility.