1987 gt wheel offset

Standard and aftermarket Wheels and Tyres

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fev1983
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1987 gt wheel offset

Post by fev1983 » Sat Aug 28, 2010 10:53 pm

hi folks need some help what is the offset of the wheels on this model? never understood this :oops: ,,
also my car is lowered slightly does this affect this? just been offerd some 15" porsche cookie cutters at a bargain price,,i know il need adapters but any advice please :dunno:



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Funky Diver
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Re: 1987 gt wheel offset

Post by Funky Diver » Sat Aug 28, 2010 11:10 pm

Pretty sure standard should be ET35.
Offset is basically how far away from the centreline of the wheel and the face of the hub (where you screw the wheel onto!), measured in mm.

If you have 2 wheels that are the same width, ET35 and ET20, the ET35 one will be 15mm further out from the hub of the car. The lower the Offset, the closer to the car body / suspension, etc everything gets.

http://www.carbibles.com/tyre_bible_pg4.html

The ET on the Porsche wheels should be stamped on them.

For all the gory details, and you'll note (possibly) that he says about 7mm is acceptable without upsetting the suspension geometry too much (so from ET28 up to ET42 in your case)

Confused.com yet? :P

EDIT : Wheel width will also play a part!!



GTXTRA
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Re: 1987 gt wheel offset

Post by GTXTRA » Sun Aug 29, 2010 11:37 am

isn't it the lower the figure that points to the wheels 'sticking out' more? eg et25 will give you more poke than et28.


theres a full set of teledials/adpators/bolts/tyres for sale over on edition 38 atm - £350 is the asking price.

here's a few TD pics.

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Serial Rocco-ist.........

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Risocco
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Re: 1987 gt wheel offset

Post by Risocco » Sun Aug 29, 2010 11:55 am

GTXTRA wrote:isn't it the lower the figure that points to the wheels 'sticking out' more? eg et25 will give you more poke than et28.
That's right Sean, mine are now an ET of 13. :good:

Alex


1983 GL
1986 GT
1994 Corrado VR6

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Funky Diver
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Re: 1987 gt wheel offset

Post by Funky Diver » Sun Aug 29, 2010 4:10 pm

See how confusing it is :D

And yes,... I was converting Offset to in and outset in my head, lol. It was late, I was confused and my wife was lurking.



fev1983
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Re: 1987 gt wheel offset

Post by fev1983 » Sun Aug 29, 2010 9:36 pm

thanks chaps i think i understand it now,
iv bought the wheels anyway so on look out for adaptors now :ebay:



eamon1.3
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Re: 1987 gt wheel offset

Post by eamon1.3 » Mon Aug 30, 2010 12:15 pm

cookie cutters should be around et50, so if the adapters are 20-30mm think thatl give you an et of 20-30. Perfect. Why cant they all be the same?


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