I am using 26:1 gearboxes and the pinion has a 1/8" bore. The set-up wouldn't have anywhere near the torque of your motors (775's, I guessing?).
For your 16:1 gearboxes, I would use a pinion with a 5mm bore and either one of the NTM outrunners like Aaron @ BotBitz is testing, or a larger sensored inrunner like this:
http://www.hobbyking.com/hobbyking/s...or_1900KV.html
If you want to wait a week or 3, I have a pair of those on the way for testing. You might want a bit different KV motor depending on your battery voltage and the speed you want - luckily there is quite a range to choose from. Will the 70mm can length be a problem for you?





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