Germanys TÜV program is strict beyond belief. In the late 80's-90's I had part ownership in a roll shutter manufacturing company, in Heimsheim outside of Stuttgart. One of my jobs was to keep all the vechiles running. I had done some modifications to 10 of our Golf Deisel and VW Transporter trucks that added over 25 % better fuel range. But they would not pass TÜV. It was easy to take the mod's off, pass TÜV and reinstall. But if one of them were to be involved in an accedent and the inspector looked under the hood, it could have been deemed "Not Covered" by the vechile insurance.
The mods were timing adjustments, Turbo mods, Intercoolers, propane injection and a few others.
"Never mount a passenger car tire on a motorcycle rim; the flat profile of a car tire is incompatible ....."
TOTALLY HOG WASH!!!
SSG/E6 Retired US ARMY Signal Corp. 9th Signal Bn, Forward.
50,000 miles on a CAR TIRE/DARKSIDE.