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Quote:
Originally Posted by BrantyB
FWIW I use 225/45 and 255/40. That matches the rolling diameter well.
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I was going to do that but Michelin PS4S does not come in 255/40 size… so I went for 215/45 and 245/40 that too closely match in terms of diameter/ circumference.
Got new tires on today, it was wet too so took it easy but like sharp steering feel and overall nice ride. Hope I can test on dry road tomorrow.
Compared with old 255/40 AS3+ replaced, my rear wheel with new 245/40 PS4S is 2lbs lighter, while my front wheel saved 3lbs going from 205/50 AS3 to 215/45 PS4S. 10lbs net loss on rotational mass equals about 70lbs static weight saving, not bad to help my 2.5 get up and go quicker 
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1997 Boxster arctic silver/ red, XNE riveted mahogany/ leather steering wheel & 917-style wood shift knob, Ben’s short shifter, PSE, 996 TB, UDP, stereo/ center console delete, hardtop and speedster humps, daily driver rain or shine or snow!
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