[ecsinc]

Can someone please explain to me how torque up gears exactly have a different ratio? I've been looking at a bunch of gears and I can't find a size difference between the gears to change the ratio.
I only noticed that the infinity torque up gears actually have a different size gear, thats why you can only use a half toothed piston. I always thought that changing ratio's involved changing the actual diameter of 2 or more gears but it looks to me like thats not the case. I also herd that more teeth change the torque ratio???
Maybe I skipped gear class but I'm kind of lost onto how they can be different ratio's and yet the gears are the same diameter? Or maybe my eyesight is off and the gears are actually all different sizes? Maybe a diagram would be good??? I just find myself lost on this part...

What brand do you recommend? I don't plan on using my gun alot, probably once a month at most... I'm looking for something cheap!