My 06 has round about 4800 miles and the front tire pressure is kept between 17-20 psi. Noticed this a while ago but it wasn't really a big concern. With my upcoming chain and sprocket swap, (original to the bike, same with tires) I'm planning on throwing some new rubber on while I'm at. So my main question is, why would a tire wear like this? Is it normal for the stock ones? maybe its just age? In the pictures you can see a big taper in the main inner knobs. There is a noticeable difference in thickness from from to rear. Pictures were taken from the right side of the bike, the front of the tire is to the right. I can't really think of a good reason a tire would wear like this. The only thing I can really think of is the majority of my riding is on road. Either way, thoughts opinions, ideas or hypothesis would be appreciated.