911sc Wheel Fitment

[nymble]

I'm looking at updating the wheels and tires on my 1982 911sc (currentlyL front- 6x16 and rear-7x16).
I've found a potential deal on a set of 9x16 Fuchs and have been told I can just swap the current rear (7x16) to the front

Digging through all the threads here and elsewhere it's hard to get a definitive answer how wells this works. There a great reference here:
Wheels fitments, all are 17" unless other wise specified

That says it's either a little work or a lip roll. I'm not sure I'm up for a lip roll and was hoping to hear from this list if this is a viable swap (rear 7x16 to the front)

The car is a daily driver project ... with plans for occasional autocross. The 9x16's look nice but I'm also not sure how they'd drive ...

Thanks in advance,

[Todd Simpson]

Tires make a big difference....are you putting 205's on the 7's or 225's?

[Canada Kev]

It will work, and a fender lip roll may indeed be required. It's pretty easy to do though. You probably have 225s on your rears now, and with them up front, clearance will undoubtedly be an issue. You may be OK with 205s.

Tires for the 9 inch (245/45-16) are getting tough to find. There are still a couple manufacturers still making them. They do look badass, especially from the rear on a narrow(-er than a turbo) body. And they fill out the rear flares quite a bit better than sevens.

[Oh Haha]

A 205/55 on 16x7 will work fine in the front of an SC. Some have fit 215s or 225s but the 205 will be the safest bet.

Here's mine with 7s front 8s rear on 205/55 and 245/45 Sumitomo HTRz-

7s and 9s(Cup wheels with adapters to correct the late model offset) on Fuzion ZRi 205/55, 245/45

[nymble]

Thanks all for the advice. I'm currently planning for the Fuzion ZRi 205/55 front , 245/45 rear (so thanks Wayne and Kevin, it's good to get first hand advice).
These will be on original Fuchs - but it may take o month to get them on. The ebay 9x16 Fuchs have some pits ... so while they were a deal, I've now need to investigate refinishing. Then again - my 82 Sc currently has a 15 foot paint job (looks ok from 15 feet :-)
Paul
Ps - will evntually post before and after pictures ....

[Oh Haha]

Just finished changing the look of mine

[CRNT918]

If you're going to autocross the car, might I suggest 225's on 16x7's all around with spacers on the rear to fill out the wheelwells. The size of tire that you can fit is more dependent on the tire manufacturer than the size listed on the tire. Also, this setup allows you to rotate the tires for longer life.

[nymble]

Thanks CRNT918 ...

[nymble]

Hi CRNT918 ...
A few quick questions on your advice:
1) on the 225's Is that 225/50? or some other size, 225/45 ?
2) What size spacers on the rear did you use?
3) Any extra work on the front required for 225 on 7"?

Thanks in advance,

PAul

[Joe Bob]

Larger wheels and tires in the rear and smaller in front was a design decision by Porsche to control oversteer of earlier cars....swb with weights in the bumpers to the later, longer wheel base. The stagger was a good idea.

Using the same size tires and wheels defeats that premise. But, it's YOUR car.....do what you want.....

9s on the rear are a waste as the 245 is about you can fit on an SC. 9s tend to be more expensive than 8s. SCs came with 6s and 7s from the factory.

[CRNT918]

Sorry I took so long, have been out of town on a bike trip.
1. 225/50/16 Bridghestone 01R's, which have been replaced by the RE11's. You have to be careful here because of the differences in sizes between tire manufacturers.
2.I used H&R 35 mm bolt on spacers with no problems as of yet, although the preferred setup would be longer studs and Turbo type spacers.
3. Fender lips have been rolled all the way around, have done this on my last three cars without any issues. I used the Eastwood fender lip roller.
To round out the setup, stock sway bars and torsion bars, Bilstein Sport shocks in rear, HD's in front, polybronze bushings in rear, strut brace and monoballs in front, max camber in front, Euro ride height.
Still to come, polybronze bushings in front, monoballs in rear, Weltmeister sway bar bushings,
Tarret rear sway bar drop links.
The car is used primarily for road rallyes and autocross, but has seen many a track day. I run 32psi all around, pump it up to 36 for autocross. A touch tail happy on entrance and exit ramps, but overall much more fun to drive than when stock.

[Locker537]

Bumping an old thread because it has some good info!

Currently, on my 911 SC:

1. Front - 6x16 - 205 / 55 / R16
2. Rear - 7x16 - 225 / 50 / R16

I'm planning on purchasing a second set of wheels for HPDE.

With Fuchs being made again, but NOT in 6x16, my plan was:

1. Front - 7x16 - 205 / 55 / R16
2. Rear - 8x16 - 225 / 50 / R16

My thought was running the same exact tire would be good for consistency. Any issues with running 7" in the front and 8" in the rear? Any issues with those tire sizes on those size rims? I do not believe so.

My car already has the fender lips rolled.

[darrin]

Originally Posted by Locker537

Bumping an old thread because it has some good info!

Currently, on my 911 SC:

1. Front - 6x16 - 205 / 55 / R16
2. Rear - 7x16 - 225 / 50 / R16

I'm planning on purchasing a second set of wheels for HPDE.

With Fuchs being made again, but NOT in 6x16, my plan was:

1. Front - 7x16 - 205 / 55 / R16
2. Rear - 8x16 - 225 / 50 / R16

My thought was running the same exact tire would be good for consistency. Any issues with running 7" in the front and 8" in the rear? Any issues with those tire sizes on those size rims? I do not believe so.

My car already has the fender lips rolled.

I run exactly the same setup on my '86 targa without issue -- one thought, if you're doing this for HPDE (track-centric), you might want to also consider going with 7x15 and 8x15 instead -- tire size is limiting, but there are a fair number of track/sporting options available for these wheels (e.g. yokohama advan ao52 in 205/50-15 and 225/50-15). Added benefit is that the smaller diameter of the 15" combo will shorten your gearing and give you a virtual boost in torque/power. You can also swap back between your current 16" set and the 15" set I'm suggesting

[Bill Verburg]

Originally Posted by Locker537

Bumping an old thread because it has some good info!

Currently, on my 911 SC:

1. Front - 6x16 - 205 / 55 / R16
2. Rear - 7x16 - 225 / 50 / R16

I'm planning on purchasing a second set of wheels for HPDE.

With Fuchs being made again, but NOT in 6x16, my plan was:

1. Front - 7x16 - 205 / 55 / R16
2. Rear - 8x16 - 225 / 50 / R16

My thought was running the same exact tire would be good for consistency. Any issues with running 7" in the front and 8" in the rear? Any issues with those tire sizes on those size rims? I do not believe so.

My car already has the fender lips rolled.

If buying dedicated track wheels then 15 is the way to go
ideally 8ET25-30 front and 9ET14-16 or better 9.5ET19 rear
tires 225/45 & 245/40

If wedded to Fuchs then 7ET23.3 & 8 ET10.6 x15 w/ 205/50 & 225/45

The lower energy cost of the 15s is really nice on a track

[Flojo]

I run 7/8x16 with 205/55, 225/50 since nearly day one on my SC.
Absolutely a nice package with fresh shocks, proper drop and alignment.
The topping was recently the new 2019 Yokohama Advand Neova RS semi slick tire.

Honestly you hardly can get more out of it for less!





no spacers!

[Mr. Merk]

If you're only using these for track use and you're sticking with 16's. Why not go with 9's?

I'm running R888Rs on 8" fronts and 9" rears

[Joe Bob]

On my 7 and 8s, I ran 225/45 and 245/45s. When the 245s got stupid pricey and NLA at Kumho, I dpld the wheels and went with 6 and 7s. 205/45 and 225/45 with one inch spacers Same outide wheel well lok and barely noticed and lack of cornering performance.

[Locker537]

Originally Posted by darrin

I run exactly the same setup on my '86 targa without issue -- one thought, if you're doing this for HPDE (track-centric), you might want to also consider going with 7x15 and 8x15 instead -- tire size is limiting, but there are a fair number of track/sporting options available for these wheels (e.g. yokohama advan ao52 in 205/50-15 and 225/50-15). Added benefit is that the smaller diameter of the 15" combo will shorten your gearing and give you a virtual boost in torque/power. You can also swap back between your current 16" set and the 15" set I'm suggesting

Originally Posted by Bill Verburg

If buying dedicated track wheels then 15 is the way to go
ideally 8ET25-30 front and 9ET14-16 or better 9.5ET19 rear
tires 225/45 & 245/40

If wedded to Fuchs then 7ET23.3 & 8 ET10.6 x15 w/ 205/50 & 225/45

The lower energy cost of the 15s is really nice on a track

Originally Posted by Mr. Merk

If you're only using these for track use and you're sticking with 16's. Why not go with 9's?

I'm running R888Rs on 8" fronts and 9" rears

Hm, very interesting and I'm glad I asked.

I'm new to HPDE. I was thinking some consistency to tire size and type would be a good thing. Two sets of similar wheels running the same size and type tires. I wouldn't expect to notice the differences in 16 versus 15 inch rims, at least not yet! I also was not considering 15 inch due to limited tire choices, but I suppose I was thinking street tires.

I wouldn't call whatever I buy dedicated track wheels, as I currently drive the car to the track and won't always be planning on swapping wheels upon arriving. More a backup set.

I'm currently running Dunlop Direzza ZIII tires.

I thought 9" rears had a higher change of running into fit issues, so was avoiding that.

[darrin]

Originally Posted by Locker537

Hm, very interesting and I'm glad I asked.

I'm new to HPDE. I was thinking some consistency to tire size and type would be a good thing. Two sets of similar wheels running the same size and type tires. I wouldn't expect to notice the differences in 16 versus 15 inch rims, at least not yet! I also was not considering 15 inch due to limited tire choices, but I suppose I was thinking street tires.

I wouldn't call whatever I buy dedicated track wheels, as I currently drive the car to the track and won't always be planning on swapping wheels upon arriving. More a backup set.

I'm currently running Dunlop Direzza ZIII tires.

I thought 9" rears had a higher change of running into fit issues, so was avoiding that.

it's the front wheels (specifically running 7" fuchs) that can have rubbing issues -- you'll have no problem running either 8" or 9" wide fuchs in the rear) The issue you run into with 9" fuchs is that they require 245/45-16, which have very limited sizing options, while the 8" fuchs use the same 225/50-16 tire size you're already using

Think we're also on the same page on "track" tires -- maybe better to think of them as sticky tires that will wear out quickly but are just fine for the street (and would be great to take on spirited drives off track too) --

Do think you'd notice the difference from running shorter wheels/tires, though -- as I understand it, the smaller diameter of the 15" tire will increase the speed your engine runs to maintain the same speed which will also result in a significant increase in perceived power/acceleration -- Somewhere north of 10% increase if I recall correctly. Not ideal for relaxed highway cruising, but a VERY effective way to increase the fun factor for minimal $$$

[Bill Verburg]

Originally Posted by Locker537

Hm, very interesting and I'm glad I asked.

I'm new to HPDE. I was thinking some consistency to tire size and type would be a good thing. Two sets of similar wheels running the same size and type tires. I wouldn't expect to notice the differences in 16 versus 15 inch rims, at least not yet! I also was not considering 15 inch due to limited tire choices, but I suppose I was thinking street tires.

I wouldn't call whatever I buy dedicated track wheels, as I currently drive the car to the track and won't always be planning on swapping wheels upon arriving. More a backup set.

I'm currently running Dunlop Direzza ZIII tires.

I thought 9" rears had a higher change of running into fit issues, so was avoiding that.

Here us one extreme example, the 15s have a 52lb-ft edge on the 16s


Againw/ custom o/s there is a wider wheel fitment envelope w/ Fuchs you are stuck w/ 7ET23.3 front and 8ET10.6 or 9ET15 rear all fit well but the shorter the tire the easier the fitment, there is no issue whatsoever in back w/ these It's the front 7 x16 w/ 205/55 tire that gets close to the lip, a 205/50 wouldn't have that problem