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Need OEM tire size for NASA Classification

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Old Sep 5, 2006 | 12:24 AM
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ExRacer
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From: Venice, CA
Need OEM tire size for NASA Classification
What was the OEM as-delivered tire with the 1987 GTA? I need this to calculate my penalty points for the 2.75/40/17s r compounds I'm running. Was it a 2.45 or smaller aspect ratio? I know it was with the 16" gold honeycomb rims.

Thanks again . .
Mike out
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Old Sep 5, 2006 | 01:09 AM
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Apeiron
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From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
That's the section width, not the aspect ratio. Your stock tire was probably a 235/50-16.
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Old Sep 5, 2006 | 01:29 PM
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Shagwell
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From: Southwest Florida
Car: projects.......
stock should be 245/50/16(was on my 89 GTA) - look at the sticker in the door jamb. It'll have the factory tire size printed on it(if it's still there/ledgible)
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Old Sep 5, 2006 | 02:42 PM
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Apeiron
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From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Yeah 245, sorry. I was thinking of the 235s on the 15 inch rims.
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Old Sep 5, 2006 | 06:35 PM
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doc
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Joined: Jul 1999
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From: Mims, Florida
Car: '87 IROCZ
Engine: 395 ZZ4
Transmission: ProBuilt 700R4
Axle/Gears: 9 bolt 3.70s
Your stock tire size was a P245/50R16.
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