are you sure that both the front AND the rear are 45 height?
I would expect the rear to be 5 less
There's also usually a bit of wiggle room in the width of the tire, meaning
if the spec requires a 235/45, then a 245/40 usually fits too
There's a lot of 911 guys who run 19" on the street and 18" on the track and I don't think they have any ventilation issues
Suggestion on DOT legal track tires:
Michelin Sport Cups
Nitto NT-01
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I still wave at Boxsters, but they no longer wave back :-(
2002 Boxster S "Violet" (sold but not forgotten)
2009 Carrera 4S "Kelsey" (current ride)
2015 FIAT 500e "Nikki" my commuter car
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