Great forum guys, I've learned a lot. I've got a 48" MTD walk behind with a sulky, about 4 yrs old. The main tires are kind of worn. I love the mower but it tends to leave what I call pivot marks in the grass if I turn sharply. With all the rain we've had all spring, it will easily tear out all the grass/roots if I'm not babying it, and even then sometimes it still does. I'm wondering if there's some trick to preventing this that I don't know, and also if getting new tires ($125) would help. I kinda think it might make things worse because the tires would grab better. I just can't win. Either the lawns are super lush and thick and take forever, or they're thin and muddy and it's all I can do not to tear up the turf. Any input is appreciated!