BBInfinite's Shimano 12T pulleys have rock solid chain control, meaning crisper shifts while Ceramitech bearings channel all your hard work to the ground.
Each road bike pulley cog set features DELRIN® 510GR construction, a fiber reinforced polymer specially suited to high strength situations where resistance to deflection is paramount, such as every time you shift. The Ceramitech bearings are in-molded for absolute security and durability as well as ease of maintenance.
These pulleys are compatible with:
5800-series 105, GS cage only
6800-series Ultegra, GS cage only (mechanical and Di2)
R8000-series Ultegra (mechanical and Di2)
R9000-series Dura Ace GS cage only (mechanical and Di2)
R9100-series Dura Ace (mechanical and Di2)
These pulleys DO NOT FIT 12spd R9200-series Dura Ace or Ultegra 8100-series group sets.
Ceramitech 12T Shimano Road bike derailleur pulleys blow the stock pulleys away when it comes to spin, and the oversize diameter reduces chain pin working angles to eliminate every bit of friction possible.
It's a mystery to us why major manufacturers ignore bottom bracket and derailleur pulley performance and continue to pump out under-performing products that sap wattage from riders who are working like mad to get faster. You have the BBInfinite bottom bracket with Ceramitechs already, and you've experienced the tremendous gains. It's time for another step forward toward your goal. Get the most out of your ride by riding Ceramic bicycle derailleur pulleys.
BBInfinite 12T Ceramitech pulleys have a 1-Year warranty.