Motor support Reversed running and has more noise when reversed running than normal running, this is a normal phenomenon, please know before buying.

3V:

681rpm   323rpm 140rpm 88rpm 66rpm 38rpm 29rpm 17rpm 13rpm 8rpm 6rpm

6V:

1363rpm 646rpm 281rpm 176rpm 133rpm 77rpm 58rpm 35rpm 26rpm 16rpm 12rpm

12v:

1931rpm 915rpm 399rpm 250rpm 188rpm 108rpm 82rpm 50rpm 37rpm 22rpm 17rpm

24V:

863rpm 409rpm 178rpm 111rpm 84rpm 48rpm 36rpm 22rpm 17rpm 10rpm 7.5rpm