Many many thanks to you. That's the data the guys from the tire shop need. Absolutely great support.
I will visit the shop next week and then my little Bonneville is back on the road with new tires which will hopefully last longer.

I'm sorry, I've to disappoint you. People from abroad often think there is no speed limit on german highways, but that's not correct. 90 percent of the highways have speed limit (65 mph, 70 mph or 75 mph). If there is no speed limit you can push the pedal to the metal and drive as fast as your car goes, but most time you can just do it for a few (2 - 5) miles and than you get a roadsign with a speed limit and you have to lower your speed back to normal.
During day time there is so much traffic on the roads, that you can be happy to reach the speed limit. Most time you are not faster than 50 mph.
If you want to drive fast, you have to drive during night time or at a official race tracks at the weekend.
The legendary 'Nürburgring', maybe you know it if you are interested in Formula 1 Championship, is just 50 miles away from my location. You have to pay $25.- just to race your car for one lap and belive me, the 1991 Bonneville in factory condition is not the right car for the track.

I love the Bonneville, because I'm 78" tall and there is much space for my legs. The steering wheel is adjustable and it has a working a/c. There are 4 doors, so my parents can jump in easily on the back seats and the trunk has enough space to carry the goods home from the supermarket.

Well, not really, I was there anyway for a planned oilchange, figured it would besilly not to do it while i was waiting.

Oh, I was just looking at the sheet again. I thought there was actual vehicle in there, but instead it looks like they are actually tolerances allowed.

Carry on, don't mind me :D