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In the absence of shock loads or abrasive contamination, typical size bicycle wheel bearings should go something like 45,000 miles before fatigue spalling kills them. That's 25 miles a day if you ride every day for 5 years. Of course, bicycle wheels are exposed to shock loading and abrasive contaminants, so getting even half that duration should be considered a result.
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It also depends on how well they were sealed in the first place, if the cones have come loose at all and if they've ever been serviced. I'd be happy with 5 years daily use.
gbj_tester
Sumo
@Adhiero
What’s a reasonable life expectancy for the hubs on QR loose bearing wheels used year-round? A 6’ 4” 95kg mate had the front wheel on his Spez hybrid go 5 years, used every day, and I think that’s pretty good but he disagrees.