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01.29.2008, 01:45 AM
Welcome to the forums!
Yes, like Sammus said, they're Mod1 and you need 5mm bore for Feigao XL motors. On this site, you'll also see gear options that are hardened, but don't use those unless you are running a steel spur (which you aren't). As far as gearing, take a look at the calculators in my sig. It'll help you figure out the gears you need for the speed you want.
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