When it comes to finding the perfect riding lawn mower, size does matter. The width of a 42 in riding lawn mower is just about right for most people. It's not too big and not too small - it's just right. And, because it's the perfect size, it will fit through most gates without any problems. So, if you're looking for a great all-around riding lawn mower that is sure to please, look no further than one that measures 42 inches wide.