So I have 42k on my 01 naked, at about 20k I got new dunlop qualifiers and a chain and both sprockets..at 30k the rear tire was bad it had a flat spot that sinks in the middle if that makes sense..I figured it was because I didn't regularly check pressure and I ride every day I also only adjusted the chain maybe 2 times... I know I know it was dumb, my rear sprocket got so bad that it warped every tooth at an angle which made the chain skip when riding ( dangerous!!). So I replaced my tires and chain and sprockets again at 30..learned from that mistake... I ended up buying higher quality chain and sprockets along with pilot powers. I still ride everyday and I check pressure once a week and tighten chain ever 500 to a 1000 miles. Now at 42k the rear tires looking like the old one?? Even though I totally changed my ways and took care of them. Take note that all of my riding is commuting on freeway about 50 to 100 miles a day.. also the tire has developed a line all the way around it, its about 2 inches from the center and wraps all the way around it. Ill post pictures later tonight, but I'm worried why my bikes wearing tires like this?