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[RC-Monster Mike]

The diameter of the Feigao motors is 36mm. "540 size" refers to the diameter of most motors for r/c cars. I thought it was the easiest way to describe the type of motors it fits. The Lehner "19" series motor (and most other motors for this purpose, such as Hacker, aveox etc) have a 36mm diameter. Yes, it will fit the "19" series motors. The 19/40 motor is sized in between the "L" and "XL" hacker/feigao motors (length).