FSA Gossamer Pro Chainring

ABS stands for Asymmetric Bolt Spacing. Unlike traditional chainrings where bolts are spaced evenly, this design places the bolts in a specific pattern to increase structural rigidity, which helps improve power transfer from your legs to the drivetrain.

This chainring uses a 120mm BCD (Bolt Circle Diameter) and is specifically designed for FSA's ABS mounting standard. It will only fit cranksets that share this exact mounting configuration, so please verify your crankset's BCD and bolt pattern before purchasing.

No, this specific model is designed exclusively as an outer chainring. It is engineered with specific ramp and pin profiles to assist with shifting from the inner ring to the outer ring, so it will not function correctly if installed in the inner position.

Yes, for the best shifting performance, you should pair this with an FSA inner chainring that is compatible with the ABS system. Using mismatched rings can lead to dropped chains or sluggish shifting under load.

This chainring is generally optimized for standard road drivetrains, but compatibility depends heavily on your specific chain and derailleur setup. We recommend checking your crankset's original specifications to ensure the tooth profile matches your current drivetrain speed.