Wow thats great. danirc so can you tell me how to actually get the reading of the RPMs from my motors do is it bet to just scour the interwebs unitl i find something. what is the best way that you have found to calculate scale speed. As far as the 600:1 ratio I can see that being a bit more accurate than 4:1. They really just need to change how they label the gearboxes. Even just a basic description like (3;!= higher to speed less torque, 4:1= lower top speed higher torque) or something.