The first number represents the width of your tire in millimeters. 60 is the aspect ratio. R means that it's a radial tire. 16 means that your wheels are 16 inches in diameter. 89 is that the load capacity each tire can handle and V represents the speed rating. Check your stems for dry rot. Bad stems are common causes of flat tires, but are simple to fix. takes a tire shop about ten minutes to fix and will cost you less than five dollars each. The hassle of having to change your tire because of a bad stem, however, is much more costly. When checking tire pressure, it is a good idea to check out your stems as well. If one needs replacing, it is likely that the others will soon need replacing as well (if you bought all your tires at the same time).