Motor size question

[Daniel C]

I have a motor that is bigger then a 550 and was wondering what size it is? I have 540 and 550 motors with and without cooling fans but this one is larger. I have looked things up about them but the numbers on the motor does not help. I have a idea it could be a 570 or a 590 but I don't know.

 

[Maximum_Quake_Pro.com]

Measure the diameter of the can

 

[RustyUs]

https://www.mabuchi-motor.com/product/knowledge/classification/designations.html