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I certainly have never done any real measurements of the cornering forces, just seat of the pants. The last two sets of 15 inch tires I had were rated as mud and snow tires, simply because there is such limited choice in 15s. They were OK for normal driving and marginal for autocross. I went from 205-50-15 front and 225-50-15s rear because it was all that I could get, to 225-45-17 front and 255-40-17s rear and summer performance Michelin PS2 tires. It is hard to stay in the seat now at the autocross if I don't get the seatbelt really tight. After 22 years and over 200 autocrosses in my 911 I can tell you with no hesitation, the tire difference change was a big improvement is traction.
The 15s were a lot smaller and lighter and the speedometer error before was off by several MPH. The new 17s are almost dead on for the speedometer.
My acceleration is almost certainly a bit slower, but a 200 HP 85 Carrera has not been a drag racer ever. I can certainly stop a ton faster now.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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