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hey guys/gals, as some of you know i finally got my 928 purchase done, 90GT, i am now looking for new wheels, 17 or 18 preferably. if you have after market wheels plz post them on your car so i can have a visual, size and makes/offsets would be great, where you bought them would be great as well
EDIT: Front: 8x18 ET52, Rear 8-10 ET52. Impressions the front offset should be closer to 60mm but handling didnt seem to be negatively impacted on the road or track (lengthy controversy about scrub radius aside). In fact the stiffer sidewall of the higher load rated tire over the OEM 16" was an over all improvement. The rear fit perfect and close to the outside lip of the fender, under a cm of clearance, but still plenty of clearance for the link rods. These wheels are no longer made but hopefully the sizes and offsets will give you some data in your selections. Look for 8" or wider front wheels to help address understeer. Offsets for 8" wheels should be in the ET60 to ET52. I cant speak for wider front wheels. Rears you have lots of options. But I thought 10" is a nice compromise of width and weight.
Last edited by Michael Benno; 01-05-2021 at 09:24 PM.
not really, i can google wheels to, i would like to know where they where bought from along with offsets etc so i know i am getting something that fits
What are your target tires and wheel widths? You have something on the order of 375-400 rwhp , are you shooting to fit 245 and 295s, or would 235/275s work? Help us help you.
What are your target tires and wheel widths? You have something on the order of 375-400 rwhp , are you shooting to fit 245 and 295s, or would 235/275s work? Help us help you.
i want the widest rear tire that will fit without modification, front at 8-8.5 wide i think is fine. i would like a 10-11 on rear if possible, probably 18", seams like a lot more options for really nice tires in that size
not really, i can google wheels to, i would like to know where they where bought from along with offsets etc so i know i am getting something that fits
Really? That thread is nothing but 928's with custom wheels installed (so they must fit...), exactly what you asked for. Probably better to find what you like in that thread and others, then inquire about what you found that you like.
You've started a thread here that's asking the exact same thing as the previously linked to thread.
I have 7 sets of non original (to 928's) Porsche wheels. Two purchased at dealerships as take-offs of new 997's (they upgraded them before hitting the showroom). One set from a local shop, one set off craigslist, one of ebay etc.... Point is, where most of us purchased our wheels isn't terribly relevant. Unless you plan on buying new from the likes of Fikse or HRE, if that's the case check out those websites and find what you like since they are custom ordered you get what you want that will fit.
Ironically, first reply in this thread are 8" wide et52 wheels which many will state are not ideal and are outside of the acceptable offset range.
In my opinion, 17" is about as big a diameter which works well on a 928.
The 18" choice seems to make the sidewalls of the tires too stiff for any of the available springs and shocks.
Certainly, some suspension re-engineering could change that, but the current level of suspension development for the 928, is in the dark ages.
i want the widest rear tire that will fit without modification, front at 8-8.5 wide i think is fine. i would like a 10-11 on rear if possible, probably 18", seams like a lot more options for really nice tires in that size
Check out post 52 on what I'm running on my 91 GT. 245/45/17, 8.5" ET66 up front and 315/35/17, 10.5" ET51 on the rear. No mods.
i want the widest rear tire that will fit without modification, front at 8-8.5 wide i think is fine. i would like a 10-11 on rear if possible, probably 18", seams like a lot more options for really nice tires in that size
Carrera III widebody version come in 8x18 and 11x18, and have a fairly 928-friendly front offset of ET57. Note that normal carrera III's are 10x18 on the rear.
They look great on a 928, and will fit on the rear of a GT (which has rolled rear fenders) - from memory, Andrew Olsen has them on his red supercharged 91 GT and used something like a 5mm spacer to make them work with wide tyres. They're hard to find - came from 997 C4S (i.e. widebody non-turbo 997).
I posted pics of my 18's on my Spyder in your "Finally" thread so won't duplicate all those photos here. It's this car.
Wheels are from CMS and look similar to the TechArt Formulas but have better front offsets than you can get in those. Sourcing them might be a problem though, as I don't believe CMS wheels are sold in the US. Had to find a dealer in maybe Ireland that could get them from the manufacturer and was willing to ship to the US - this was all pre-Covid too, but I had a specific look for the car that I wanted to achieve and these were the ones I thought fit the bill.
Specs are
Front - 18x8 - offset 57 with Nitto Invo 235/40-18
Rear - 18x10 - offset 65 with Nitto Invo 295/35-18 and 15mm spacer (but my rear fenders aren't stock)
In my opinion, 17" is about as big a diameter which works well on a 928.
The 18" choice seems to make the sidewalls of the tires too stiff for any of the available springs and shocks.
Certainly, some suspension re-engineering could change that, but the current level of suspension development for the 928, is in the dark ages.
This is absolutely true - I have 18" Carrera 3's on mine right now, and you can go pretty wide (10" rears). The car doesn't handle quite right. I will go to 17" Cup 1's in the spring. They look the best, and I've had them before - handling is exceptional.
when you say 17 is better handling do you mean if pushed on a track or just everyday driving, sometimes spirited. im not taking this car to a track is why i ask, thanks
This is absolutely true - I have 18" Carrera 3's on mine right now, and you can go pretty wide (10" rears). The car doesn't handle quite right. I will go to 17" Cup 1's in the spring. They look the best, and I've had them before - handling is exceptional.
I actually think 18s work the best on the 928, both visually and from a driving persepctive. The suspension is already pretty compliant compared to other cars (at least other cars I own like the 997 and 914) so you don't need the sidewall of the tire to add further compliance - to my feel, it just adds mushiness and wander before the car sets up in a corner. To each their own.
Even with fresh shocks and sport springs, still plenty of compliance when cornering as you see here.
when you say 17 is better handling do you mean if pushed on a track or just everyday driving, sometimes spirited. im not taking this car to a track is why i ask, thanks
No, I'm talking pure street use.
I'm not "Ricky Racer" on the street. Too crowded and too dangerous. I'm looking for good cornering ability, good looks, with a nice ride. The amount of "G" loads that a current 17" tire can do, compared to what a current 18" tire can do, on the street, is completely moot....anyone playing with those "limits", on the street, is a complete idiot.
The fender arches of a 928 were designed for 15" wheels. 16" works well. The correct 17" wheel works. I've never seen an 18" wheel and tire that works, artistically. (Just my opinion.)
Track use is a completely different situation, where stffness doesn't matter. Who cares about the ride on "track day".
The fact that people take their 928's to the track, with the pitifully poor suspension pieces that are available, shows the fantastic potential of the 928 platform.
I compare the current technology of the 928's, in track configuration, to the technology we used in the early 1980's on 911 track cars. Yes, we had fun and got our thrills, but the same 911 platform we ran in the early 1980's is 10-15 seconds a lap slower, on any race course, than the same car, today.
(That's "before" the dark ages that our 928 street cars are currently stuck.....)
Rob Edward's played around, quite a bit, trying to make 18's "comfortable" for the street and finally gave up. Switched back to 17's to get more compliance and a much better ride.
01-05-2021, 08:46 PM
wheels.....
