Hi, can one explain to me why the 205/55R16 91 with a speed index of V (up to 240KM/H) are in the vehicle licence, but the 225/45R17 91 with Y (up to 300KM/H). In theory, it would be possible to achieve a higher final speed with the thinner tyre (205er). Example : Should a tyre of the size 225/45R17 91H (up to 210KM/H) be entered extra. (M+S or summer tyres) ? What does it even want to say : 225/45R17 91 Y is in the bill, at a registered top speed of 207 KM/H also a tire 225/45R17 91 H can be driven without further registration in the bill.