Smalls I can almost guarantee you that when your using 766's you arent letting them break in long enough.
But again I would recommend 766's for monster stocks unless used on a small-medium sized track and ONLY on the - side.
1/12th scale can use them on both sides.Sedan only - in most cases.Offroad the MS likes 766's on both sides but they have to be FULLY seated which actually takes a lil bit.
FatDoggy is EXACTLY right.
Your recomendation is for the WRONG motor.
Reedy(yokomo),Atlas(Integy),Top(Peak,Orion) all HATE trinity and Putnam brushes.
So please before giving someone advice please try it yourself or at least have experience with that particular motor so you dont cause someone to invest money in the WRONG brush.
KH15-If running onroad the 767 on the + and a 766 on the - and higher gearing compared to Trinity(Epic) motor's is the way to go.
Goodluck and have fun racing guys.
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Just wanted to say Thanks to RcTech for all these years of Great Information.