Shimano Ultegra FC-R8100 / FC-R8100-P – 50T Outer Chainring, 12-Speed
The Shimano Ultegra 50T outer chainring is a genuine Shimano replacement component designed for the FC-R8100 and FC-R8100-P road cranksets.
Engineered for Shimano Ultegra 2x12-speed drivetrains, this 50-tooth chainring is intended to be paired with a 34-tooth inner chainring, creating a versatile 50/34T compact gearing configuration.
Whether replacing a worn chainring or restoring the original gearing of your crankset, this Shimano component is designed to maintain smooth, precise front shifting and reliable drivetrain performance.
Key Features
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50-tooth outer chainring: Designed for a compact 50/34T double-chainring configuration.
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12-speed compatibility: Developed for Shimano Ultegra 2x12-speed road drivetrains.
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FC-R8100 compatibility: Fits the standard Shimano Ultegra FC-R8100 crankset.
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FC-R8100-P compatibility: Also fits the Ultegra crankset equipped with an integrated power meter.
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Shimano original replacement part: Designed to preserve the intended shifting performance of compatible cranksets.
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Road cycling application: Suitable for compatible Shimano Ultegra road bicycles.
Technical Specifications
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Brand: Shimano
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Series: Ultegra R8100
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Product type: Outer chainring
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Manufacturer part number: Y0NG98010
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Number of teeth: 50T
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Drivetrain: 2x12-speed
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Recommended chainring combination: 50/34T
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Compatible cranksets: FC-R8100 and FC-R8100-P
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Bolt circle diameter (BCD): 110 mm
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Mounting configuration: Shimano four-arm crankset interface
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Colour: Black
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Application: Road cycling
Compatible Cranksets
This 50T outer chainring is officially listed by Shimano for:
The same chainring can therefore be used on both the standard Ultegra R8100 crankset and the power meter-equipped version.
Important Compatibility Information
The 50T outer chainring is intended for use with the matching 34T inner chainring, Shimano part number Y0NG34000.
Compatibility should be confirmed using the exact crankset model and Shimano part number. A matching tooth count or bolt circle diameter alone does not guarantee compatibility with other cranksets.
Replacement and Maintenance
Inspect chainring teeth regularly for wear or damage. When replacing a chainring, check the condition of the chain and other drivetrain components.
Follow Shimano's installation instructions and specified tightening torques to ensure correct mounting and shifting performance.
Note: This product is a replacement outer chainring only, not a complete crankset or power meter.
