Directionally specific chains for road racing. The latest chains from Dura-Ace, Ultegra, 105, and Tiagra feature a unique new asymmetric design. Therefore, the direction of rotation must be considered during installation. The specially shaped links optimize engagement on the sprocket, resulting in even smoother shifting under load. To save weight, these chains have cutouts on the inner links and hollow rivets (the latter only for Dura-Ace).

Shimano HG (Hyperglide). The chain transmits power from the chainring to the rear hub sprocket. It is subjected to extreme loads and weather conditions. Chains wear at different rates depending on usage conditions, but each must be replaced sooner or later. Timely replacement of the chain is the only way to protect chainrings and sprockets from excessive wear. To maintain the best possible performance of the Shimano Hyper-Drive system, it is important to use original Shimano HG chains.

Chain • Number of links: 118 • System compatibility: 10-speed. Dimensions • Weight: 290 g. Delivery contents • Delivery contents: including chain pin. Main information • Material type: steel • Purpose: derailleur system • Type: chain. Details • Details: - Group compatibility: Dura-Ace, Ultegra, 105, Tiagra / for all Shimano 2x10-speed road bike drivetrains - Reduced chain clamping at the crank / smooth shifting even under high load - Less strain during shifting and riding / cutouts on the links save weight - Newly shaped inner links for smoother shifting at the rear - Redesigned outer links / clean shifting function at the front.