CS-R8101 Ultegra 12 Speed Socks with additional foam padding in

with additional foam padding in key contact areas

Designed to work with Aero dish rims

and a new companion app for phones to allow for easier setup and route uploads

while the lenses offer anti fog and UV protection to keep developing eyes safe

Award-Winning Audio

CS-R8101 Ultegra 12 Speed Socks with additional foam padding inThe uninterrupted shifting experience of the ULTEGRA R8100 12 speed cassette range lets you climb, sprint, or cruise without stopping to think about your next gear change. Larger driving cogs maximize drivetrain efficiency and create compatibility with both Shimano 11 and 12 speed FREEHUB bodies. HYPERGLIDE+ cassettes revolutionized off road shifting with its seamless shifts both up and down the gear range. Now it's time for the technology to change