Got 12L4 it had old jaco foams,bought new jacos.I need flanged bearings for front.In the rear the tires rub on the lower pod plate,I guess the offset is different?Common sense says add shims but I would have to add a bunch,and im asking because maybe im missing something here?I got a 75 tooth spur,what size pinion should I try for a 19 turn on a medium sized track?What ride height for outdoor fairly smooth asphalt?Thanks in advance.