Hey guys I just received my pro 4 and was wondering if the spur gear that comes with it "98 tooth 64 pitch is "metric". I believe I read in one of the rc mags that it had a Metric module gear and that it was not compatible with SAE 64 pitch gear. Do I have to buy special hpi pinions? Also, does anyone have any good gearing for 19t chameleon1 based motor , running foams , running on a slightly large asphalt track?