Originally Posted by LukasM
It's not quite like that even in the EU, but if your bike has certain non-approved changes - that get discovered when you are in an accident - then it is likely that the burden of proof will be upon you to show that there was no causality. And rightfully so, IMO.
For example if you are running sticky racing tires then it won't be hard to prove that your stopping distance was not negatively affected, but the same can't be said for pure offroad racing knobbies if you run them on the street.
This is why in a few countries in the EU (for example Germany) the vehicle manufacturer together with the government has to establish a list of tested and approved tires, specified down to the exact manufacturer, model, load rating, and speed index.
Nanny state for sure, but it has both advantages and disadvantages. Of course this applies only if you are running on public roads, where the choices you make are possibly directly affecting others.
...and somewhere KTM has a PDF (here
) with the approved tyres. The TKC's are M+S rated, so you are also covered in winter in Germany, where it is a requirement in the winter months. They also have non brand specific tyre size for the 690 listed