Quote:
Originally Posted by Showdown
Just keep in mind that a 50 series tire is fairly low profile and doesn’t have a large sidewall. This may be advantageous for autocross or track but for street use you may find it a bit harsh in addition to requiring 4000 RPMs at Highway cruising speed because of the smaller diameter tire.
Another thing to consider is how hard you’re actually driving this car. Modern tires are exponentially more advanced than what Porsche had access to when these cars were built and much of that may be lost unless you are a very accomplished driver on a track or autocross circuit.
And finally, a big chunky tire makes these cars feel very lively and fun to drive at moderate speeds; something that will disappear with a very high performance low profile tire
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yes the 15s have shorter sidewalls and will ride more harshly than 16s or 17s for the same width and profile but the return in the performance area is worth it, This are sports cars aren't they?
as to cruise RPM it depends on the trans but for a '76 915/44 w/ 225/50 x15 rear tires 4k rpm is 87mph /60 for early SC is the same. ;72-73 915/02 will be 82