The pulley wheels are the fastest spinning bearings on your bike. An upgrade to a fully ceramic bearing is therefore the most effective upgrade. C-Bear ceramic pulley can be used both for road, cyclocross and MTB, and can save up to 8 watts.
Full-ceramic bearings have ceramic balls as well as ceramic races: weighs less, spins smoother.
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C-Bear Alloy Pulley Full Ceramic Jockey wheel Shimano/Sram 10-11 spd
These Aluminium Jockeys wheels with Full ceramic bearings are a treat to save you watts, whether a sporting event or a headline TT they are sure to help you with that PB.