How long will your balls last?

There are several vendors who advertise dry lube or dry treated bearings; that is, bearings that do not use grease. The claim by the manufacturers is that the bearings have some lube impregnated into the bearing to reduce friction and eliminate the need for conventional lubricants. Having worked with with coatings in the past, I was a bit skeptical. Matt at Enduro Bearings was also skeptical so decided to test the bearings on his bearing tester. The bearing tester at Enduro is a beast of a machine that applies 100 pounds of radial load and 50 pounds of thrust all spinning at 135 rpms.

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