Thanks for your thoughts guys.
Back in the day we used to do a small mod to the gearbox casing which allowed us to fit one or two extra shims and fit a smaller pinion, this allowed us to run the higher revving brushed motors to good effect and conserve the limited battery capacity we had then.
Nowadays the capacity limitation has gone but it is difficult to judge the equivalency between the brushed and brushless motors but I'm certain that a 5.5T would be well over the top, whereas a 10.5T perhaps is worth a try as I do use them in my 1/12 and a 13.5T in my GT12.
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