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did full size Pontiacs have a wider steel wheel than the gto rim ? how do you tell besides trying to mount it, whether a stock Pontiac steel wheel will mount on a single piston disc brake set-up?
 

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GTOs came with 14" wheels, larger Pontiacs came with 15"... Here is some data on them.

did full size Pontiacs have a wider steel wheel than the gto rim ? how do you tell besides trying to mount it, whether a stock Pontiac steel wheel will mount on a single piston disc brake set-up?
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This came from the GTO restoration guide.
 

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In 1965 the non GTO LeMans and Tempest received a 14 x 5 wheel.
The GTO and full size cars came with 14 x 6 wheels.
 
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