My bike is finally needing new tires. I still have the stock Pirellis. I am getting a lot of slides from both back and front the knobs are rounded. I only ride in my own woods and pastures in Missouri mainly grass and soft dirt. Probably anything put on is going to be an improvement. Aggressive riding, I am as aggressive as any sexagenarian who has ridden for 40+ years. My stock tires sizes are 70/100-19 and 100/100-16. I am thinking that if I get good hook up I will want more power.