Shimano Ultegra FC-R8100 12-Speed Chainrings - 52T
Replace one ring or build from scratch — genuine Shimano Ultegra, sold individually.
The Shimano Ultegra FC-R8100 chainrings are engineered specifically for 12-speed 2x road drivetrains. Whether you need to replace a worn ring, complete a bare crank arm assembly, or mix gearing to suit a specific course, PDL.Bike stocks the outer rings (50T and 52T) and inner rings (34T and 36T) as individual items. Buy exactly what you need — outer ring, inner ring, or both.
Compatible cranks only. These rings are designed exclusively for the Shimano FC-R8100 and FC-R8100-P cranksets. They use a 110mm asymmetric 4-bolt BCD that is unique to Shimano's modern 12-speed road platform — they will not fit older Shimano cranks or other brands.
What makes this worth it
Hollowglide Outer Rings
The 50T and 52T outer rings use Shimano's Hollowglide construction — hollow-pressed profiling that reduces weight while maintaining the stiffness needed for fast, reliable front shifts under power.
12-Speed HG+ Optimised
Tooth profiles are engineered specifically for Shimano's 12-speed HG+ chain. The narrower chain width of 12-speed drivetrains requires precise geometry — these rings are built for it from the ground up.
110mm Asymmetric BCD
The asymmetric 4-bolt 110mm bolt circle is unique to Shimano's modern road cranksets. It mounts directly to the FC-R8100 and FC-R8100-P spider — no adapters, no compromises.
Shift Assist Pins
Strategically placed shift assist pins and ramps guide the chain during front derailleur changes. Upshifts and downshifts are smooth and decisive, whether you are on the flat or mid-climb.
Buy Inner and Outer Separately
Shimano sells the FC-R8100 rings individually — outer and inner listed as separate products. Mix and match to suit your gearing needs, or replace just the worn ring rather than the whole set.
Pairs with the FC-R8100 Arm Assembly
Buying a bare FC-R8100 crank arm assembly? These are the rings that bolt straight on. PDL.Bike stocks both the arm assembly and the individual rings — build your exact Ultegra drivetrain without compromise.
Specifications
| Brand | Shimano |
| Model | FC-R8100 Ultegra |
| Compatible Cranksets | FC-R8100, FC-R8100-P |
| Speed | 12-Speed |
| BCD | 110mm Asymmetric 4-Bolt |
| Chain Compatibility | Shimano 12-Speed HG+ |
| Outer Ring Sizes Available | 50T, 52T |
| Inner Ring Sizes Available | 34T, 36T |
| Outer Ring Construction | Hollowglide (hollow-pressed aluminium) |
| Sold | Individually (outer and inner listed separately) |
(4186)
Hollowglide Outer Rings
The 50T and 52T outer rings use Shimano's Hollowglide construction — hollow-pressed profiling that reduces weight while maintaining the stiffness needed for fast, reliable front shifts under power.
12-Speed HG+ Optimised
Tooth profiles are engineered specifically for Shimano's 12-speed HG+ chain. The narrower chain width of 12-speed drivetrains requires precise geometry — these rings are built for it from the ground up.
110mm Asymmetric BCD
The asymmetric 4-bolt 110mm bolt circle is unique to Shimano's modern road cranksets. It mounts directly to the FC-R8100 and FC-R8100-P spider — no adapters, no compromises.
Shift Assist Pins
Strategically placed shift assist pins and ramps guide the chain during front derailleur changes. Upshifts and downshifts are smooth and decisive, whether you are on the flat or mid-climb.
Buy Inner and Outer Separately
Shimano sells the FC-R8100 rings individually — outer and inner listed as separate products. Mix and match to suit your gearing needs, or replace just the worn ring rather than the whole set.
Pairs with the FC-R8100 Arm Assembly
Buying a bare FC-R8100 crank arm assembly? These are the rings that bolt straight on. PDL.Bike stocks both the arm assembly and the individual rings — build your exact Ultegra drivetrain without compromise.
| Brand | Shimano |
| Model | FC-R8100 Ultegra |
| Compatible Cranksets | FC-R8100, FC-R8100-P |
| Speed | 12-Speed |
| BCD | 110mm Asymmetric 4-Bolt |
| Chain Compatibility | Shimano 12-Speed HG+ |
| Outer Ring Sizes Available | 50T, 52T |
| Inner Ring Sizes Available | 34T, 36T |
| Outer Ring Construction | Hollowglide (hollow-pressed aluminium) |
| Sold | Individually (outer and inner listed separately) |
| SKU | 4186 |
| Brand | Shimano |
