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#cyclingceramic #rideshimano #ospw #bearings #ceramic
This video showcases the details of the stock pulleys installed on Shimano Ultegra R8150 (12-speed) derailleurs and the CyclingCeramic 12-speed Shimano pulleys.
Shimano pulleys are made of nylon and feature steel bearings with fairly high-quality seals compared to previous models. However, the steel bearings require lubrication with a transparent grease that slows down the pulley's rotation. In contrast, CyclingCeramic pulleys are made of CNC-machined aluminum.
They come with steel cage bearings and, most importantly, ceramic balls, all manufactured in France. Due to the quality of the bearings, lubrication can be done with oil, significantly improving efficiency. If steel bearings were lubricated with oil, they would rust.
The efficiency difference between steel and ceramic balls is indeed imperceptible at 400 revolutions per minute, and the advantage of ceramics lies in the possibilities of high-performance lubrication not achievable with steel bearings.
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