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I did not mean to confuse. I meant that the speed of the periphery of the wheel is greater the larger the wheel in relation to the speed of the hub. The periphery of the wheel travels faster than the...

The buffer speed is based on a 6 inch wheel. The periphery of a 4 inch wheel is turning less than the advertised 3450 RPM and smaller wheels will be even slower. There is a formula to calculate that....

That would not be my choice. Harbor Freight sells a 6" buffer that works fine for about $40.00. Spend the money you've saved on 4" spiral sewn cotton wheels (2 per grit) and greaseless compounds from...