I only have about 3 hours on these bearings but they work great with my latest Troy Bilt Bronco 42" cutter. I bought new spindles from 8ths at Revain before checking the spindle housing. Everything was fine, only the bearings were bad. I cleaned and oiled the old spindles and installed the new bearings. Very easy. I will keep the new 8Ten spindles as a backup (and they came with grease for easier maintenance).