ACSGP

Anyone used them before?

Looking at the 17" Profil 5, and have sent them an email.
http://www.fikse.com/profil.html

Will keep the boards posted if anyone is interested.

I hesitate to go to 18" due to the Porsche Bulletin, but dislike the tyre choices in 17".

joey bagadonuts

Yes, I've had a set in the past. Very popular among racers, as well as, enthusiasts looking for a high-quality aftermarket option: lightweight, well-made and gorgeous. Profil 5's are a good choice since they'll be much easier to clean.

My (previous) 964 with FM10's

wellcraft290

Buddy has the 10s as well on his 964 is very hot.

race911

Taken over by Kodiak out of Canada sometime last year after they closed their doors. I have 3 sets around, never bought new, but have used for years on 964 and 993. 17 and 18".

What's the problem with 17" tire fitments? 225/45 and 255/40 are readily available. (And I've run/tracked/raced 18's on a 964; never had a problem.)

ACSGP

Unfortunately not with the newer tyres of my choice, such as the Michelin PS3, the Conti CSC5 and the Goodyear Eagle F1 Asymmetric.

Quite a wide choice among the older versions such as the PS2, RE 050, CSC2/3 but the smaller the rim, the choice gets less.

Tyre manufacturers also slow production of the older tyres down, and if you do find some in the shop, they usuallyhave an earlier manufacturing date. For example, am looking at the CSC3 as they're the lightest among the ultra high perf summer, and have them on the Audi, but the date is early 08 on the 17's, while I can get early '10 for the 19"s.

joey bagadonuts

Have you considered the Toyo Proxes T1R's? Light and fast.
http://toyotires.com/tire/pattern/proxes-t1r

BlueRiver86

We used them for quite some time on our Grand-Am cars, as many teams did. We went elsewhere for cost concerns, but never had a failure or issue with a Fikse wheel.

race911

OK. I've never gotten excited over street tires since the P7 was state-of-the-art. No one is ever driving any street car at/over the limits of pretty much any decent quality tire these days. Nor have I ever paid much attention to manufacturing dates on non-race rubber.

ACSGP

I understand that the Fikse's can be custom made.

So assuming that the bolt pattern is fixed, but I can vary widths and offsets, what should I do with an 18" size to replicate the 964RS Mg Cup 1 looks which are flush with the bodywork?

Front: 18x7.5 or 8? Best offsets for either w/o rubbing, to be flush with the fenders w/o rolling them.

Back: 18x9 or 9.5, to clear the oil lines, and flush w/o rolling again. Offset?

joey bagadonuts

I wouldn't advise pushing the wheels out so that they are flush with the fenders. As soon as you hit a bump in the road, you'll experience rubber to metal contact.

8 x 18, 52mm offset, 235/40/18
9.5 x 18, 47mm offset, 265/35/18

Also, you may want to double-check with FIKSE on available offsets. While the wheels are made to order, the offsets are probably limited by wheel halves dimensions. The FIKSE people are also very familiar with Porsche fitments and can probably get you a quick quote with recommended offsets, as well.

ACSGP

Thx Joey, helpful as always.

This is what I'm trying to achieve when I mean flush:


My current set-up is not pushed out as much.

So no problems with the oil lines if you go 9.5 at the back for a narrow body?

I also get a funny rubbing noise on full lock with my 17x7.5 from from front left wheel well (driver's side for LHD). Will the 18x8 exacerbate the problem?

Andrew

joey bagadonuts

It's hard to provide a definitive answer on any of this, Andrew, since all of these cars are slightly different. But the rear oil line issue should be fine with offsets in the 47-48mm range. The front rub at full lock will be similar--not dramatically worse. The contact generally occurs between the outside shoulder and plastic well liner, so it's relatively harmless, IMHO.

You can also estimate your new offsets using a plumb line and ruler. Just hold the line against the fender lip and then measure the distance from the line to the tire sidewall. At the rear, if you're on Factory wheels with 55mm offsets, the difference should be around 15mm. So to get your tires flush with the arch, you would subtract the gap from the offset which nets out to 40mm.

Again, that would be a bit much and most likely cause the tire to hit the wing but, at least, you'll know what kind off room you have to work with. Also, don't forget to factor in any changes in overall width dimension. While going from a 255 to 265 rear pushes the tire out only 5mm, you'll see that you really don't have much leeway when you also "decrease" the offset.

Good luck.

ACSGP

Fikse are suggesting 58 mm for the front in 18", and 50 mm at the back. Looks like they're suggesting the stock Cup 1 look. Will take your advice and go with the 52 and 47, if and when I decide.

I would assume that if you go with the 9.5" at the back, all else being equal, the 50 has a greater chance of fouling the oil line than a 47 mm.

Totally powder coated in silver and with Porsche centre caps, think they'll look good and close to OEM. More importantly, they'll be light and I can dial back the spring and damping rates on the KWs for a better ride on the street.

Bill Verburg

Fikse are suggesting what they can make, which is not necessarily whats best for your car.

the #s suggested above are the most commonly used on 964s
ie
8 ET50-52(oe fitment)
9ET55(oe fitment)
9.5 ET~47(oe was 9.5 ET68 w/ a 21mm spacer)
10ET65 have also been used w/ a 21mm spacer which brings the ET down to 44

Fikse Wheels

Bill, some of the dimensions I am suggesting are limited by what we can make in a particular style. That said we may be splitting hairs here. The stock front wheel on a 964 is 7" wide with a 55mm offset. The 8" wide wheel I suggested is 1/2" wider to either side. There are never any rubbing problems with any 225 section width tire. The difference to the 52mm offset is 4mm or 0.157".
The rear wheel in 9.5" width with a 50mm offset is an excellent fit on the car and again 3mm is a very minute difference. That difference however will keep a tire with a wider section width from rubbing on the fender.