I personally don't like mixing tyres. Even RE50s & 40s.
That the tyres are only round until 168.75mph is a moot point: IIRC, the spec. in the bible demands my car be fitted with a Z-rated tyre. I think it would only attain such velocity if I were to drive it over a cliff with a following wind...
I do not believe there are ANY correct Z-rated tyres any more. So what are the insurance company to suggest? I drive it on bald decade old tyres?
Nick
“I find myself irresistibly attracted to cars that nobody else buys. The NSX is a classic of the genre because nobody buys it and yet it’s a fantastic car. It’s got a wonderful compactness and simplicity and unpretentiousness to it. Honda rudely continues to make them whether we like it or not, even though there can be no commercial logic in doing so — I thoroughly admire that.” Rowan Atkinson