Reply To: 2016 Q3 build challenge – derby cars Home › Forums › MOCs › Build challenges! › 2016 Q3 build challenge – derby cars › Reply To: 2016 Q3 build challenge – derby cars July 22, 2016 at 12:11 pm #17111 Greg SchubertParticipant Tim wrote: Also, is there a weight limit? for cubscouts, that all start with the same kind of wheels and the same block of wood, weight is a big factor in how well a car does