RPM for a 22" residential push mower

3600 RPM on a 22" blade results in a blade speed of 20735.\
Most pushers are 21" rated but not actually 21 or 22. They are say 20 and 3/4 or 7/8" for example. So slow down with the new buzz term of the day of blade tip speed. The grass police won't be by to arrest you.
 
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