GT3 wheels on C4S
#2
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The std C4S offset is et50 front and et45 rear. When equipped with sport techno wheels, factory 17mm spacers are used in the rear, thus they use a et63 rear in that situation. Hope that helps.
#4
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my C4S came with GT3 (Option) but the Offset is diffrent from the Wheels that come on the GT3, i have the Correct Offset 50/45 but it was an Option for Turbo/C4S from Factory
#5
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The fronts will work fine. For the rears, you will need wheels spacers. I don't think I would bother trying to put GT3 wheels on a C4S when you can find used Turbo wheels all over with a going rate of around $1k a set. If you could find a set of GT2 wheels with 18x12" rears, it would be a different story since they are made for a wide body.