One of the more reliable solutions to this problem is using a 3M scotch tape. Stick onto the area where the knee guard scrapes the tank and be rest assured.
The main advantage with the 3M scotch tape is that, it wont damage the paint on the tank when you wish you remove the tape.
thanks for all your responses for my previous post. Again I need your help.
Please tell me how to know whether the rim is bent or not as I just ran over a pot hole with a speed of 80-90 and after that i feel slight bubbling in my front wheels. Unable to know as in gurgaon there is no smooth road is there pls help me how can i find whether my rim is bend or its just the roads fault