When your lawn mower needs new tires, your first temptation may be to get a set just like the ones that were on it. That is not a bad option, but before you make that decision, you may want to think about a few things. Just like cars, lawn mowers are sold with tires that should work adequately well for the largest variety of people. However, if you have noticed anything unsatisfactory about how your lawn mower has been performing, you may want to consider a change of tire type.
Consider the terrain on which you use your lawn mower. If it is fairly flat, chances are good that you do not need a rugged, grippy lawn mower tire. If you use a walk-behind mower, you will probably want to stick with plastic tires, although metal ones can also be an option. With a riding mower, you will have a choice of tires that are inflated with air, just like your car's tires.
Prepare your lawn mower appropriately for rougher terrain, if you have it. If you regularly mow a steep, hilly terrain, consider tires with more grip to them--perhaps even spiked tires if the grade is especially steep. Much like studded tires, these should only be considered on very rough terrain, as they will rip up your lawn.
Consider tires with regard to minimizing turf damage. Tires with flat treads are wonderful for damage reduction. However, they are only effective in areas where traction is not required. Combining this trait with beveled shoulders results in a tire that is turf-friendly and has decent traction. Some treads are ribbed, which is also fine for your turf.
Think realistically about what kind of maintenance you are willing to perform. While they are more commonly available for riding mowers, tires that are inflated with air are also available for walk-behind mowers. Just like on any other vehicle, these tires require that a certain air pressure (PSI) be maintained. If you will not be willing to check their air pressure and maintain it regularly, you may want to consider plastic or steel tires if they are available for your lawn mower.