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Hello all I am just wondering if the wheels from this link https://www.design911shop.com/18--KT...-130/prod5180/ will fit my car as I’ve looked everywhere and can not find any other, I have spoke to one person and they said the offset is wrong, my car is a S4
Kind regards
brandon
The offsets on those wheels are a lot less than original which will mean they sit wider, i.e. further apart, as if you were using spacers of 1/2" at the front and 3/8" at the rear. Apart from potential issues with rubbing on the wheel arches, this should not be a problem at the rear, but it does significantly change the steering geometry at the front, reducing the Negative Scrub Radius. This will change how the car feels and steers and some will say make it dangerous. Others will say it doesn't really matter and indeed some will say you won't notice it in normal road driving conditions.
Whether you are happy with this is up to you, but be aware of the ramifications of these changes before committing to them.
An 8" et 65 is about ideal. These being 8.5" if they had the same offset would be 1/4" further in and further out, so 6mm or so, but then the offset difference of 65 to 52 is another 13mm, together that's 19mm or about 3/4". Visually, I think these are going to stick out from the fenders too.
Personally, I don't think using those is a good idea unless you have your ride height set at the OEM 4x4 look and have the front fender lips rolled. My car is set a bit low, but I ahd an 8" et52 wheel on it and the tire caught the fender lip in a medium speed turn with a bump in the center. I swapped those for an 8" et57 wheel, rolled the fender lips and haven't had that problem since.
Here's my 8" et 57. These wheels you're looking at would be 11mm further out. (wheel is turned a little in this photo).
An 8" et 65 is about ideal. These being 8.5" if they had the same offset would be 1/4" further in and further out, so 6mm or so, but then the offset difference of 65 to 52 is another 13mm, together that's 19mm or about 3/4". Visually, I think these are going to stick out from the fenders too.
Personally, I don't think using those is a good idea unless you have your ride height set at the OEM 4x4 look and have the front fender lips rolled. My car is set a bit low, but I ahd an 8" et52 wheel on it and the tire caught the fender lip in a medium speed turn with a bump in the center. I swapped those for an 8" et57 wheel, rolled the fender lips and haven't had that problem since.
Here's my 8" et 57. These wheels you're looking at would be 11mm further out. (wheel is turned a little in this photo).
Do you have a supplier of the wheels with the correct offset please, if so could you send me the link as it would be much appreciated and she’s sitting very pretty mate, if I do say so myself looks naughty
Do you have a supplier of the wheels with the correct offset please, if so could you send me the link as it would be much appreciated and she’s sitting very pretty mate, if I do say so myself looks naughty
If you want an 18" oem Porsche wheel, the Panamera wheel is a great fitment. You can get any wheel that has a 5x130 bolt pattern with a 71.6mm cwnter bore is 8" wide and has an offset from 57-65 and the higher number is better from steering axis and geometry standpoint. I don't know what fits the rear of a normal 928 as mine is a convertible with very wide fenders. I'm running a 10" wide wheel with a 295 width tire and still needed a 15mm spacer to push them out to the fenders.
+1 on Panamera 18s. After watching auctions for a while I got a set for $400 + shipping (eBay) to replace 16" "manhole covers" and have never looked back. The many happy 928 converts for these wheels have near-OEM offsets (59F, 53R), the choice of dozens of modern tires, full lock-to-lock steering with no rubbing, and a decent aesthetic match for the car in either 5 or 10 spoke versions. With tires of 245/35 in front and 265/35 or 275/35 the S4 will corner like a modern sports car.
The ride is harsher due to 2" less tire height and a heavier wheel/tire combo - not a problem but noticeable.
If you have more particular taste, any custom 3 piece wheel company (Fikse is well known for 928s) will trade a few $K for OEM offsets of 65F, 53R but no off the shelf suppliers make that size. There is a very cool-looking wheel in the style of the original "phone dials" discussed here. If you get them, be sure to post!
Tires/wheels are second only to oil and just ahead of stereos in terms of number and passion of Rennlist postings. ×
I was under the impression that OEM offset on the rear was ET60. Did that change for later cars? In which case when was the change?
Non-staggered 16x7" wheels 78 through 86.5 were all 65mm offset front and rear.
When they went to the staggered 16x7 front and 16x8 rear on the S4, the fronts were identical to the previously 16x7 wheel with 65mm off set. the rears gained 1 inch on the outside of the wheel to creat the 16'8 which effectivly pushed the off set to 52.3mm.
The optional club sport wheels did have the 60mm offset. Whey were 16x8 et 60mm front and 16x9 et 60mm rear.
when the GTS was updated to 17 inch wheels it got 17x7.5 et 65mm front and 17x9 et 55mm on the rear.
Non-staggered 16x7" wheels 78 through 86.5 were all 65mm offset front and rear.
When they went to the staggered 16x7 front and 16x8 rear on the S4, the fronts were identical to the previously 16x7 wheel with 65mm off set. the rears gained 1 inch on the outside of the wheel to creat the 16'8 which effectivly pushed the off set to 52.3mm.
The optional club sport wheels did have the 60mm offset. Whey were 16x8 et 60mm front and 16x9 et 60mm rear.
when the GTS was updated to 17 inch wheels it got 17x7.5 et 65mm front and 17x9 et 55mm on the rear.
Thanks for that. Not sure where I got the ET60 for the originals (I don't have) on my S4.
Might be a dumb question, but here goes: As the rim gets wider the offset must increase to keep the outer edge of the wheel in the same relative position to the fender. Is there is a simple math ratio to this? For example, if going from 7.5 to 8 inch rim, looks like the offset increases by 5mm. Is this a liner relationship? Even if it's not there should be a simple equation (or graph) that to show the 'correct' mix to leave the outer edge of the wheel in the same relative position.
Might be a dumb question, but here goes: As the rim gets wider the offset must increase to keep the outer edge of the wheel in the same relative position to the fender. Is there is a simple math ratio to this? For example, if going from 7.5 to 8 inch rim, looks like the offset increases by 5mm. Is this a liner relationship? Even if it's not there should be a simple equation (or graph) that to show the 'correct' mix to leave the outer edge of the wheel in the same relative position.
For a wheel with the same offset every change in width gets equally divided between the 2 sides so a 1/2" width difference changes the outer lip 1/4" (6mm or so) and the inner lip 1/4". If you then adjust the offset of the wheel by that same 1/4" then the the change in wheel width ends up at one side only. Yes it's linear and just adding and subtracting millimeters.
If you want a cheelat sheet go to www.willtheyfit.com and just key in the current wheel dimensions and the new wheel dimensions and it will show you the changes.
Offset is simply the distance form the mounting flange to the centre line of the wheel. In and of itself offset is largely irrelevant until it is contextualised by the car it is being fitted to and then in terms of steering geometry it is the critical dimension. Beyond that changes in width simply move the outer and inboard faces around. Change the width and change the offset to achieve the same spacial position of say the outboard face and you change the steering geometry. No fancy formulas just simlpe arithmetic
That Porsche came up with something rather different for the 928 is what it is but why it had to be that way I have not really given any thought to such- doubtless there will be a very good reason. Needless to say most wheels for Porsche cars do not have the correct front offsets [see the thread about "negative offsets" - that will really blow your mind!].
With respect to the OP's thread, there are countless wheel threads that cover offset and why it is an important consideration. It is one of those design details that make the 928 the excellent machine it is and very forgiving when driven by idiots. However remove such characteristics and as I never get tired of writing, going sideways at 100 mph and about to hit a tree is not a good time to realise you really should have had ET65 up front as Porsche intended!
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