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The standard tire size for the 1978 Cadillac Seville were GR78-15 tires with a width of 207 millimeters. The rim size measured 15 inches and the wheel diameter came in at 27.7 inches.A 215/75r15 is the current/contemporary radial replacement for the G78-15 tire.


See the related link for the automobile catalog and further information.

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Q: What is the tire size range for a 1978 Seville?
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