..Thanks, The noise is like "ssk". just like that. Not feel any resistence or shaking. The worst I can not tell from where exactly comes. What is sure that the curble at each time on the same position as I wrote earlier.
Interesting is the noise happen only when I pedalling also with the left side pedal. If I pedalling with the right side and not make any force on the left pedal no noise happening.
I will try to record the noise with the mp3 recorder. Will put it near to the back wheel, after near to front wheel and after to the crank set and will see where is stronger and can analyze the noise.
losi