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My first bearing (left rear) started howling at around 100,000. At first I diagnosed it as tire noise and realized after a tire change that it was the bearing.
If you are REALLY cheap (like me) you can DIY a tool. The key part is a very robust standoff or cup to receive the bearing as you draw it out. I had one of these lying around from a prior project (mcmaster-carr 45735K437). With that, some heavy washers, nuts, and threaded rod, its pretty easy to pull the bearings. I have since done the other three with the same rig.
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