I believe the pressure inside the tires decreases in the winter because of the cold and increases in the summer when the air is heated up making it expand and add more pressure
Yes, there is enough space . If the guinea pigs need 12 feet, and 5*3= 15 feet then they have enough. ( idk if means 12 feet of living space for each or all 3 , but here i hope it helps :) )
