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I have a 2006 Porsche Cayman with the Techart wide body kit

I have Techart Formula GTS wheels (20") with spacers on the back

The tires are 285/30/20 I have cracked both rear wheels and this just isn't working so I found a set of the same wheels in 18s


18x8.5 (et-40) & 18x11 (et-25)

Should these fit right up like my current ones do?
 

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I have a 2006 Porsche Cayman with the Techart wide body kit

I have Techart Formula GTS wheels (20") with spacers on the back

The tires are 285/30/20 I have cracked both rear wheels and this just isn't working so I found a set of the same wheels in 18s


18x8.5 (et-40) & 18x11 (et-25)

Should these fit right up like my current ones do?
We don't know what size and offset your 20" wheels were, but there is a tire and wheel size calculator around here somewhere (in the FAQ I think) and referenced in prior threads where people have asked the same question, basically if you search for "Wheel offset" you'll find a lot of topics on the subject and likely an answer that applies to your wheels.
 
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