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Pete1612

Original Poster:

3 posts

23 months

[news] 
Thursday 4th October 2012 quote quote all
Hi newbie here from Leeds,

I'm looking to upgrade the alloys on my 987 Boxster and have bought a set the same as these, but a little cheaper may I add and they are in transit:

http://www.pistonheads.com/sales/4204945.htm

They are 18x8 front and 18x10 which seem all OK for a Boxster, but I'm concerned and also confused on the offset:

Front offset = ET37 and Rear offset = ET58

Will these fit or do I need to sell them ?

Appreciate any help
Pete

SDoran

21 posts

42 months

[news] 
Thursday 4th October 2012 quote quote all
I fear that the Boxster's rear wheels are narrower than a 911's, maybe 265 rather 295 from memory? On 911 wheels the wider body models, like C4(S), have a different offset to narrower bodied models, like C2(S). Unfortunately I don't know if your wheels are the narrow or wide bodied versions. Hopefully someone more knowledgable will be able to help.

You maybe able to return the wheels or ebay them - demand for winter wheels/tyres should start to pick up round now.

Good luck.

Pete1612

Original Poster:

3 posts

23 months

[news] 
Thursday 4th October 2012 quote quote all
Hi, thanks for the reply. Just looked at the add on what I have bought and the tyres sizes on the wheels are:

Front - 235/40 R18 8J Offset 37

Rear - 265/40 R18 10J Offset 58

Does this help with the killer question - are these too big for a Boxster 987


6C4GTS

4,854 posts

63 months

[news] 
Friday 5th October 2012 quote quote all
If you know the current offset and width of your boxster wheels the answer is just a click away.
Post up your current wheel spec and you will get a mm perfect answer.

MadMark911

1,567 posts

34 months

[news] 
Friday 5th October 2012 quote quote all
From memory I think the larger rear offset of the Carerra wheels means that they will protrude beyond the bodywork and the 18" Carerra wheels have an even larger offset than the 19" Carerra wheels ....



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Trev450

3,446 posts

57 months

[news] 
Friday 5th October 2012 quote quote all
I'm sorry to say but they are the wrong sizes. Correct size and offset for a 987 Box is:

Front 8X18 ET 57 235/40/18
Rear 9X18 ET 43 265/40/18


boxsey

1,962 posts

95 months

[news] 
Friday 5th October 2012 quote quote all
Pete1612 said:
Hi, thanks for the reply. Just looked at the add on what I have bought and the tyres sizes on the wheels are:

Front - 235/40 R18 8J Offset 37

Rear - 265/40 R18 10J Offset 58

Does this help with the killer question - are these too big for a Boxster 987

The tyre sizes are correct however the standard 18 inch wheel sizes for a 987S are: 8J et57 and 9J et43. Use this wheel offset calculator to compare these specs to what you're intending to put on:

http://www.1010tires.com/WheelOffsetCalculator.asp



I think you'll find the reduced inside clearance at the rear could particularly be a problem (which might be overcome by fitting spacers)

I noted from the ad that they are winter tyres which might explain why a 265/40 is on a 10J rear.

ETA: Trev beat me to it.

Pete1612

Original Poster:

3 posts

23 months

[news] 
Friday 5th October 2012 quote quote all
Thanks folks for the advice. Wheels arrived this morning. Look lovely.

I'm going to get 2 small curb marks repaired, a bit of spit and polish and back on that favourite auction site.

Tyres are in very good condition so I'm hoping to atleast re-coup most of the £460 layout incurred for a set of 4 Porsche wheels.

Live and learn, live and learn.....


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