Tire for a 10" wheel, size 3.50 (model F578). The first number is the rim seat diameter in inches, the second is the section width (or width/aspect ratio in percent). The tire provides grip on the road and absorbs bumps.
Replace it if the tread is worn, or if there are cracks, bulges or punctures that cannot be repaired. Monitor tire pressure and compare the size with the one marked on the old tire: the rim and the tire must match each other.
