Shimano Dura-Ace 14t 1/8" Track Cog Black CheckoutSpec= For all 2015+rear derailleurs RSR - Building on the

RSR - Building on the impressive original the new RSR compound is a dual layer tread rubber with the soft RSR compound on top and the stiff SRC on bottom

Knurled tread with siping provides great traction for braking and cornering

60t standard for Road/Gravel and 80t stock on Mountain

Ercolina Upper Body Power simulates in an extremely realistic way the movements of cross-county skiing

2mm tubing 4pc design Revised geometry and shape Larger diameter top bend for cleaner look and more resistance to bending

Shimano Dura-Ace 14t 1/8" Track Cog Black CheckoutSpec= For all 2015+rear derailleurs RSR - Building on theShimano Dura Ace Track Cogs1. 37" x 24 tpi Black Tooth Count 14 Teeth 14T Width 1 8"