Dura-Ace CS-7900 Ultegra CS-6700 10-Speed 11t 1st Position Cog B Fit 105 CS-5800

This is a Shimano 10-speed 11t 1st position cog. It's designed with a 'B Fit' for 105 CS-5800 and is also compatible with Dura-Ace CS-7800, Ultegra CS-6700, and CS-6600. With a cog thickness of 1.6mm, it offers great performance and durability. Tooth count: 11.

Using this Shimano cog is easy. First, make sure your bike's drivetrain is clean and in good condition. Then, carefully install the cog in the first position as per your bike's specifications. When riding, shift gears smoothly to avoid unnecessary wear. As for maintenance, regularly clean the cog with a mild degreaser and a soft brush to remove dirt and grime. Check for any signs of wear or damage, and if you notice anything unusual, it might be time to replace it. Remember to store it in a dry place when not in use to prevent rusting.