Though your tire size is spec for your mower... the load capacity for tires will vary according to ply rating and air pressure... Any particular tire size is used on various different mowers...
Your tires will have a max inflation, but you do not need to inflate to the maximum... inflate according to your load on the tire....
Higher inflation on front tires typically steer easier.... but you may have a slightly harsher ride as there is less side wall flex at higher tire pressures... :smile:KennyV