What RPM should the planetary achieve at stir speed versus speed #10?

At stir position, the planetary should turn at approximately 60 RPM, and at the #10 position it should turn at approximately 255 RPM. The exception is K45SS models built before May 6th, 2002, which turn at approximately 280 RPM at the #10 position.

From the official KitchenAid KSM150 Stand Mixer manual, page 4

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