Could you have the spindle nut too tight? I’d put wheels on it and take it to the track then see how free the hubs true with the wheels still on. I know some put are going to disagree, but I wouldn’t replace the grease with Tri-Flow. Maybe lithium grease. There must be grease experts on the forum. Hope they can provide a better answer.
LAD Specialties customer / tony kart / rotax / kt100