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Thread: IROC tire size

  1. 08-29-2021, 05:21 AM #1
    H-viken
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    IROC tire size

    The IROC cars used 9 and 11 inch wheels. Anyone know what size GoodYears they were clad in?
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  2. 08-31-2021, 02:49 PM #2
    patrick911
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    I'd say - but I'm not sure - that since the IROC cars were largely equal to the 1973 RSRs that it would be fitted with 9x15 on the front and 11x15 in the rear.
    The RSRs were shod with Dunlop Racing tires 230/600 – 15 CR88 in front and 260/600 – 15CR88 in the back, so I would expect this to be similar sizes for the Goodyears on the IROCs.
    edit: page 90 of the book "Porsche 911 - Rallye- und Rennsportwagen" by Juerg Austen lists the same sizes regarding the Dunlops they were fitted with.
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  3. 09-01-2021, 10:31 AM #3
    H-viken
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    Thank you!
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