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I haven't really noticed any issues. Hope the pics helps a bit even though not the best angles
The front fenders feel like they've been rolled by the previous owner. As for the rear fender it's such a tiny sliver I've heard other people just shave it off rather than roll.
Regarding rubbing, I only hear it in the rear when there is a dip in the road. That's mostly b/c the sidewall of my tires are too square I'm sure an alignment adjustment would fix that but i'm ready for new tires so i'll just pay closer attention to my choices.
Your rears look similar to mine. The fronts might be a bit further in than mine are when using 15mm spacers, although it's hard to be sure from the pictures. I guess the simplistic way of looking at it is that my wheel is now 10mm further in by going from 65ET to 55ET. The wheel is 0.5" narrower than the original one but I don't think that should make a difference. The original position used a 15mm spacer, therefore a 5mm spacer would probably put it where it was but I reckon I could easily get away with a 10mm spacer to fill the arches more. The 15mm spacer was too far out.
I've no idea what difference the 5mm or 10mm scrub radius would make to handling. 5mm spacers up front would be an easy solution but it might still look a bit tucked for my taste.
Those would be on C2s though. You think Cup racing car setups are transferable and useful for a C4 that will primarily be used on the road? I wonder how much those setups might require on some aspects of the suspension being beefed up and presumably those cars weighing less? I've only just bought these wheels so I'm not really inclined to buy more just yet.
I think the basic question I want to answer at the moment is how much of a spacer would be the limit for not introducing significant issues due to scrub radius, with the goal being to move the front wheels out a bit so they don't look quite so tucked.
My secondary question is that I think the rear track might end up wider than the front and I wonder how important that is. I suspect it's not going to be a significant enough of a change to make much difference for mostly fast road driving with the possibility of the occasional fun track outing, but it's yet another thing I don't know enough about.
Yes,
22545/x17 has a 25" OD
235/45 x17 has a 25.3" OD,
255/40x17 has a 25.2" OD
either of the first 2 can be used in front w/ the 255 in back, 235/ reduces understeer wrt to 225
if going to the widest rear wheel a 275 is the biggest I've generally seen in use
275/35 is 24.6" OD
matching front would be a 245/40 @ 24.8" OD
It depnds on what you want from the car.
The original 964 Cups wanted less understeer so the spec'd 8ET52 235/40 & 9.5 E47 255/40 x17 for the rear
as the series progressed and spread some went to235/40 Y 265/35 or 245/35 & 275/30 x18, to complement what ever suspension they were running
currently its common for 8.5 Et48 235/40 & 10ET51 275/35 x18
in 17 235/40 & 275/35 on the same spec wheels only in 17
Hmmmh. Hey Bill. what's your thoughts on this:
Just picked up a set of wheels to replace my CUP 1 Reps:
The new set came off 964 with Coilovers at very low ride heights(see attachment)
I was looking at replacing tires to 225/40 & 265/35 Combo.(Never been a fan of huge tire stretch or stance, just a FUCHs look fan)
Did a test fit last weekend and the fronts stick out way too much. Seems like almost an inch past the fender. I see the pictures of the same wheels on 2 separate 964's and they appear to fit nearly flush.
I know I'll need an alignment once I get my new set of tires, but will adjustment of camber/toe make that much of a difference to make the wheel more flush? Excuse my ignorance.
Might want to start your own thread for better visibility....
To answer your question. Get an alignment and lower your car more. Based on the previous owners pic.. They are slammed with likely more camber to get it to tuck and fit better.
@DTMLGND As I previously mentioned, it looks like you have positive camber and your car doesn't look lowered at all even though you have H&R's on it. I would drive over to Sleeper's Speed Shop and get their opinion, they work on lots of cars on here with similar fitments.
The new set came off 964 with Coilovers at very low ride heights(see attachment)
I was looking at replacing tires to 225/40 & 265/35 Combo.(Never been a fan of huge tire stretch or stance, just a FUCHs look fan)
Did a test fit last weekend and the fronts stick out way too much. Seems like almost an inch past the fender. I see the pictures of the same wheels on 2 separate 964's and they appear to fit nearly flush.
I know I'll need an alignment once I get my new set of tires, but will adjustment of camber/toe make that much of a difference to make the wheel more flush? Excuse my ignorance.
Suggestions greatly appreciated.
A PO look.
The new wheel has +.9" for f/s compared to the old 7 but the narrower 215 tire on the new wheel has only ~+1-2 mm more f/s. It may be an illusion due to the wheel's extra f/s
similarly in back the new 10 has +.5" f/s compared to the old 9 but the 255/35 mounted on it has the same f/s as the 17's
I know lots of 964 that run 8.5" fronts w/ ET from 40 to 48, the lower the numerical ET the more f/s it has
Might want to start your own thread for better visibility....
To answer your question. Get an alignment and lower your car more. Based on the previous owners pic.. They are slammed with likely more camber to get it to tuck and fit better.
Thanks for your input!
Originally Posted by Vegas993
@DTMLGND As I previously mentioned, it looks like you have positive camber and your car doesn't look lowered at all even though you have H&R's on it. I would drive over to Sleeper's Speed Shop and get their opinion, they work on lots of cars on here with similar fitments.
Thanks Frankie!! Yes, on all accounts and I have been thinking of bringing it down to Sleepers.
Originally Posted by Bill Verburg
The new wheel has +.9" for f/s compared to the old 7 but the narrower 215 tire on the new wheel has only ~+1-2 mm more f/s. It may be an illusion due to the wheel's extra f/s
similarly in back the new 10 has +.5" f/s compared to the old 9 but the 255/35 mounted on it has the same f/s as the 17's
I know lots of 964 that run 8.5" fronts w/ ET from 40 to 48, the lower the numerical ET the more f/s it has
in back 10s usually are 45 to 51 w/ 275/40 max
Thanks Bill!! I thought you might offer a detailed explanation and makes total sense.
I happened to spot a pair of genuine Porsche 5mm spacers online so I grabbed them.
Unfortunately I forgot that I've got the RS brakes and hubs up front... Oops.
So, a pair of Porsche 5mm spacers are available in the EU if anyone wants them...
I might be getting used to the look of the front without spacers but I still think it looks a bit too tucked, so I've got some H&R 7mm spacers coming. I'll pop them on and see if I think it's worthwhile before changing studs.
I do wonder how it would look without any spacers at all but I'm fairly certain it would look too tucked. It would probably be best from a handling perspective though. Maybe I should take the 18mm spacers off the back, along with the rusted nuts that are holding them on in a death grip, and see what it looks like... I'm fairly sure I won't like it though...
For the self correcting nature of ABS to work the scrub radius must be 0 or negative, positive scrub radius cause the car to dart to the side the more positive the stronger the nature of the dart
std. for a 964 is 7ET55 this imparts a s/r of 0, a spacer makes the scrub radius + by the thickness of the spacer
pre 964 911s have a s/r of +52.4 when a 7T23.3 wheel is used, this imparts a huge amount of feedback into the steering wheel which is what makes them feel like living things when driving, they do not have ABS so the self correcting feedback loop doesn't matter, but even so every effort needs to be made to not increase s/r any more.
If you care more about looks than driving by all means space them out, drivers will use 8 or 8.5 and tires to fill the wheel wells out
04-01-2022, 09:45 AM
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