Bought my V-Star 1100 about 2 1/2 years ago after being off a bike for about 20 years. Love the bike, but the front tire does not last on it. Bike tracks straight. It has Pirellis on it. replaced both last January, The front is nearly worn out but the back still looks new. The front is worn a little more on the left side of the tire than the right. When I bought it the front was worn out but the back still had decent tread on it & they were Pirellis also. Never seen this before, Any ideas?