Tire with weird wear.

hey guys, i bought a new tire (Bridgestone Battlax 140-70-18) on the stock rim, and i've got maybe 5000 km/s on the damn thing, but its almost bald. I'm not squidding around and I've never done a burnout on it. Could it be the compound of the tire? the front tire is the same make and model and its basically brand new. any ideas?

 

post a photo...was it a bt45?

 

I hade that same size and brand tire back on my 87 750VFR erlier, wears fast,yes. most to blame is that the tire profile suffer from the narrow 3,5 rim (its design for a 4.0 rim) and therefore the cantact are is smaller than it should and wear werry fast. The BT45 rears beeing known for wearing fast anyway.
As I mounted of the tire and it got its normal chape back, the center was like a dip.