What Is the Shimano Tiagra CN-4601 and Where Does It Fit?

The CN-4601 is Shimano's Tiagra-series Hyperglide 10-speed road chain, designed specifically for road triple drivetrain applications including Ultegra 6703 and 105 5703 triple crankset setups where chain line angles across three chainrings demand a chain with directional plate geometry calibrated for that shifting pattern. This is not a general-purpose 10-speed chain: it is specifically tuned for road triple use and is not compatible with Shimano 10-speed Dyna-Sys mountain bike drivetrains, which use a different chain width and plate geometry. The directional inner and outer plate design orients each plate's contact geometry to align optimally with the Hyperglide cog tooth profile for clean, quiet engagement and smooth lateral chain movement during shifts even under high pedaling load.

The CN-4601 uses chromized rivet pins that increase hardness at the pin-plate interface, the highest wear point in any chain, which extends service life compared to standard uncoated pins by resisting the abrasive wear that elongates chain pitch over time. Perforated side plates reduce weight without compromising structural integrity. Chain length is 116 links and should be sized to the correct length using standard chain sizing method for the specific crankset and cassette combination. For road cyclists maintaining a Shimano 10-speed triple road drivetrain who need the correct Hyperglide chain specification for proper shifting performance across three chainrings, the CN-4601 is the accurate replacement to run.