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      08-13-2011, 01:45 PM   #23
Denk
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A very popular size on a 19" is 255/35f, 275/35r. I'm running that combo but will go back to OEM 245f/265r next tire change. It's not as stout looking but I prefer the feel better.
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      08-17-2011, 11:52 PM   #24
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Quote:
Originally Posted by CeeBoogie View Post
Nah, the 19's were 4 seconds faster than the 18's because of the added grip
255/35R19 front, 275/35R19 rear: street

275/30R18 square: track

The 18s are WAY faster, but it's because of the tires, not the diameter.
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      11-24-2018, 08:13 AM   #25
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The car and driver article has moved to here.
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      11-24-2018, 09:56 PM   #26
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Quote:
Originally Posted by RedCardinal View Post
Dude, that post was over 7 yrs. ago. Thanks however...

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      12-03-2018, 09:14 PM   #27
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since this post is up, quick question... Why does Porshe GT3 come with 20 inch rims instead of 18s?
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      12-12-2018, 10:20 AM   #28
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Quote:
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since this post is up, quick question... Why does Porshe GT3 come with 20 inch rims instead of 18s?
Because the consumer market likes the aesthetic of larger wheels. Porsche's have gotten bigger and bigger. The larger wheels maintain the aesthetic they desire. Same with brakes, the huge calipers and rotors need larger wheels. Note that the 20" wheels on a GT3 still have reasonable sidewall heights. Equivalent to the sidewall heights we have with 19" wheels on an e92. That being said, guess what the Porsche cup cars run???? And pretty much every race car built today? 18". There are little, if any, true racing slicks made in larger diameters. Hoosier has 19"+ R7 but those aren't true slicks.
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      12-12-2018, 11:29 AM   #29
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Quote:
Originally Posted by slicer View Post
Because the consumer market likes the aesthetic of larger wheels. Porsche's have gotten bigger and bigger. The larger wheels maintain the aesthetic they desire. Same with brakes, the huge calipers and rotors need larger wheels. Note that the 20" wheels on a GT3 still have reasonable sidewall heights. Equivalent to the sidewall heights we have with 19" wheels on an e92. That being said, guess what the Porsche cup cars run???? And pretty much every race car built today? 18". There are little, if any, true racing slicks made in larger diameters. Hoosier has 19"+ R7 but those aren't true slicks.
+1

The Porsche has 20 inch wheels but it also has a much larger overall diameter for the wheels than the M3. So the GT3 can mount taller sidewall tires even with 20" wheels. The M3 has a smaller diameter for the wheels so a 20" would need super thin tires to fit. They're different cars designed for different wheel sizes.
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