I have the Enduro Bearings Zero pulleys that are hybrid ceramic and made out of Delrin. I was curious why companies like Hawk Racing and Ceramic Speed use aluminum for their pulleys. The Enduros weigh 9 grams total for the set compared to the 24 gram Ceramic Speed and 17 grams for Hawk Racing. If it's to cut weight, Delrin seems to be lighter.

I had some cheap chinese aluminum pulleys once and they drove me crazy with how loud they were

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