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I have always read a speedometer cable spins 1001 rpm @ 60 mph. Can someone tell me why it spins 1001 rpm rather than 1000 rpm? Or 995 rpm? Or 1016 rpm? Why the odd 1001?

Who decided 1001 was how fast it's supposed to spin at 60 mph? I'm sure there is a reason for the odd number but I'd like to know what it is.

When lubing speedometer and tachometer cables it's best to use graphite only because grease type lubricants eventually shed their oil and then the cable starts grabbing the inside of the housing. I have tried Vasoline and it worked great at first but when I attempted to pull it out several years later I had trouble pulling it out because it had some kind of sticky gunk on it.
 
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