These Kogel pulleys spin on Grade 3, ABEC 5 hybrid ceramic bearings, the same bearings as Kogel's bottom brackets. The pulley wheels are made of aluminium which will make them more resistant to wear. These pulleys are for ROAD USE only. (Road seals). This road seal version runs with minimal contact seals to achieve the lowest friction.
Kogel's ceramic derailleur pulleys run on the same trusted ceramic bearings that are used in their bottom brackets. Using aluminium instead of plastics for the wheels makes them durable, especially for off road use.
Out of the box, these pulleys will fit on:
• Shimano Road (R5700, R5800, R6600, R6700, R6800, R7900, R9000)
• Campagnolo 11 speed