The bike is 10500Km, tyres are in midlife, surely i will go to check the steering bearings. But what you say -Orestis- could be true because i have been running for about 2500 km in straight highway with little or no lean.

Im induced to blame that kind of tyre wear because i can not feel any sound or roughness in the head steering when the bike is stopped.

Do your Teneres, apart from being heavy to turn behave in any similar way when turning? i mean apart from the increased force needed to make a full turn, is it a smooth turn?