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Thank you. That is very generous of you to offer to drive part of the way. I haven't decided which direction to go yet, but I will definitely keep these at the top of my list and will let you know either way once I've made a decision.
Thanks. Even Fikse doesn't list the available offsets on their site, and neither does 928GT. I will contact them to see what they say. It is hard to discount the Carrera wheels based on offset if the Fikse offset is unknown. Anything will be better than the hollow spoke turbo twists that I have now.
As for tires....I am pretty set on the Yokohamas that I listed in my first post
Fikse will not list offsets as they are custom build orders. To get the kind of front offsets required on a 3 piece wheel the outer section will typically be a 1 1/2 inch section and the inner will be an 8 inch section to get a 9.5 inch wheel. The forged centres are usually made to a fixed format so when Dave orders such wheels from Fikse he will advise them what is required and they will then build to suit or so I suspect.
I know that these will be a less than ideal offset, but I can get them quickly, and they are cheap enough to be worth a shot to see how they fit and perform. If they don't fit right, or I don't like them, I can always go with the Fikse wheels, which would definitely fit right, but I would have to wait longer for them.
Everything should arrive by the middle of next week. I'll post photos once I have them mounted.
Those are real good looking wheels and the 235 gives a nice enhancement over stock. At least you are aware of the pro's and cons of your purchase and for the most part you will be pleased with them- 18 inch wheels just look right on a 928 but 19 inch wheels just look wrong to my eye and 8 inch gives you good options tyre wise.
In the long run, I may upgrade to the Fikse wheels as you recommended. They would be ideal. But, I want to get this on the road asap. The rear tires are too worn to be safe. So, this gets me there quickest. Now, if only I can get the new clutch installed
great points fred! most folks are more interested in form over function, and as long as that is safe, that's fine. like a lot of 928 owners, I am running Carrera lll wheels: 8 x 18 ET 58 up front
with 235/40-18 and 8 x 10 ET 57 with 295/30-18. main reason for this choice is I really like the look, they are a proven fit, AND lots of those wheels around so they won't break the bank.
Originally Posted by FredR
The first question you need to be clear about is "what exactly do you want to achieve"? Many folks talk about wheels "fitting" when in reality they should be talking about wheels "working".
Many will tell you they have front wheels with offset of ET55 and they "work" whereas what they are really saying is that they have satisfied their own personal needs and that is fine. The thing you do not want to discover is that they do not work when you are going sideways at 150 mph!
The 928 front suspension is somewhat unique in the Porsche family in that it is the only vehicle that requires a front wheel offset of ET65 to achieve the NSR [negative scrub radius] Porsche designed into the suspension geometry. I once had a set of reverse spoke wheels from another Porsche model with ET52 up front. They looked great and filled the front wheel well nicely but on autocross duty they were useless- my stock S4 wheels/tyres performed much better and I thought they were crap!
A set of GTS wheels fitted with a 235 up front and a 265 on the rears works reasonably well but if you want real cornering performance they are still below par by today's handling standards. If you do a low mileage you can fit same size but with DOT legal rubber and that improves things. If you want to get the best cornering performance from the car you need wider rubber. Stick a 265 section up front and a 295 rear can be "loose" if you do not have the anti roll characteristics well sorted. To carry this kind of rubber you need custom 3 piece wheels and I reckon the combination I run with is about as good as one is going to get with 9.5 inch x ET68 up front and 10 inch ET60 on the rears. This combination works nicely on the S4 but such wheels do not come cheaply unless you are really fortunate. Wheels of this geometry are typically 3 piece forged alloy made by the likes of Fikse and others.
There is a Porsche OEM wheel either 9 or 9.5 inch wide x 17 with a suitable offset [if you can find them] in the Cup 1 [early GTS] design. The closest I know of in a current Porsche OEM fitment are the Panamera wheels but then they fall short of the mark offset wise and I would not use them unless I had no alternative. That being said many do run with them and are happy with their purchase.
By my calculations 9.5 with et68 would result in the tyres making contact with the arch, it might work on a 8.5, are you sure about those sizes?
I am running an 8.5 et60 which struggles to fit in the arch.
Thanks. Even Fikse doesn't list the available offsets on their site, and neither does 928GT.
This is because every wheel order is custom made to the proper specs for your needs. My recommendation for 18s is a 9" front with 255/35 tire and a 10.5" rear with a 285/30 or 295/30 tire (depends on manufacturers actual size specs. As close to 25" Overall diameter is a MUST for a 928. Plus or minus .2" or so. Anything taller and the suspension geometry is negatively affected as well as the overall look.
Hope that helps,
Dave
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David Roberts
2010 Jaguar XKR Coupe - 510HP Stock - Liquid Silver Metallic
928 Owners Club Co-Founder
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Thanks. You seem to really know the score on this topic. If my interim wheel/tire combination doesn't work out the way that I want, my next step will be ordering some wheels through you.
06-06-2018, 10:58 AM
