1/18th gearing

[craig smith]

looking for some advice on gearing for the ftx changed to a pro motor last week and started out with a 12/45 but had mesh problems so went back to 16/45 and burnt the new motor clean out you can probably still smell it in the hall also what gearing should be used on a 6000 brushless system
cheers guys

anybody got any views on 1/8th schumacher swifts and how old they are please