Hello to all tire professionals. I am interested in whether balancing machines for wheels have to be calibrated regularly or it is up to every factory city itself to carry out such a maintenance. Had problems with the summer tires last year (4 new Conti Sport Contact) and I tinged from one balancer to another, but all with different results. The success was sometimes better, sometimes worse. Partially the difference was between 20g and 40g. The wheel was only accelerated by hand, with one running the wheel in the horizontal and then also different vertical devices. The principle is the same everywhere, but which is the better one? I read that the force machines can be adjusted from 1g on. Works with this overhaup t someone or are 5g standart/usual? And last but not least, I would be grateful for a recommendation in Munich or in northern surroundings. Someone who works closely and takes time. Greetings Rico