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As long as they are functioning properly then there is no need to change them IMO unless you are looking for every scientific advantage for less friction = more power measurable only by gauges in a lab. Just make sure they are clean and lubed, they should function for a long time. I have had the Bullseye seal bearing pulleys, ans I was still the last guy up the freaking hill. Not to bust your chops on Campy ( I grew up on racing on CAmpy and will always love them) but Shimano has been mention several times.
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