STPA R/C Mini Rod class pulling tractor. The tractor uses Servocity 1/4" shafts, .770 hubs, 1/2"x 1/4" bearings, 16t 5mm pinion and aluminum spur gear. It took first at R/C pulling Midwest Nationals by over 2'. I run a Castle 6900kv 1406 motor on 3s for power and a mg996 servo handles steering. The truck weighs 6# and typically pulls 25-30#. All chassis, front axle and suitcase weights were machined by me.
(ServoCity.com Parts Only)