I burn through a set of pulleys every cross season...I guess mud and muck aren't good for em I actually wear them down, its not the bushings/bearings. I was thinking about going with some ceramic bearing, aluminum, pulleys. I have a set of cheapo aluminum pulleys on the training bike but I don't have many miles on them. Will the aluminum pulleys last longer? Will it wear the chain more quickly? I was thinking about buying these