Hello, in the registration certificate part 1 is a tyre size, which is soon no longer used than summer tyres: 225/40 R18 86W. I thought about changing to 16 inches, more precisely 205/55 R16 91V. Both original car manufacturer rims. Now I have read that you can not drive with a lower speed index in the summer than indicated in the registration certificate part 1. Is this true and can/must have the registration certificate part 1 changed? he does not drive the car anyway as H, but must take afaik V due to first registration before 05/2009 and the regulation “safety surcharge”. 2. Concerns = tyre choice The decision is currently made on the Hankook Ventus Prime3 K125. Are there any reasons that would speak for nen Pirelli Cinturato P7 Blue, Continental ContiPremiumContact 5, Goodyear EfficientGrip Performance, Dunlop Sport BluResponse or Michelin Primacy 3? Important would be comfort, little noise in the interior and handling s as well as brakes on dry road.