[simplechamp]

I've read a lot about gearing lately, and didn't quite understand the term "rollout ratio" so I decided to research a bit. A pretty common standard for gearing is 1 revolution of the motor to rotate the tire 1". So if your tire had a circumference (2*pi*radius) of 20" you would setup your gearing so that the final ratio was right around 20:1. This gives a rollout ratio of 1:1, or simply 1.

Supposedly this is a good, safe setup to start with when gearing a vehicle, and will allow your electronics to run effectively and efficiently, and avoid thermaling, etc. That isn't to say you shouldn't gear higher, but the farther you go past 1 will start heating things up more and drawing much more current.

I calculated my gearing to get a 1:1 rollout for the E-revo and supposedly it will put me right at 30mph which is exactly what I want. Also, that tells me I could go a bit faster without worries of overgearing.

Just wanted to see what others think of this method and if they follow it. If you are having thermal issues/puffing packs/smoking ESCs go to the speed calc and see how close you are to a rollout of 1. You might be surprised. And if you are under 1 and still having issues that's a sign there are probably other issues at play that need to be remedied.

Again, please remember this isn't a hard and fast rule, your mileage may vary, there are many other factors at play in such a complex system.