Jump to content
Impact Bumpers
786

16x8 vs. 16x9 rears

Recommended Posts

Hey guys, searched and didn't see a thread on this. Maybe I missed it.

My car is an '85 Euro spec 3.2 with 16x6 front and 16x7 rears. I'd like to eventually get a set of 15" wheels but for right now I wanted to also try a set of 16's. 

What I was thinking was to move the 16x7's that are currently on the rear to the front and buy a pair of either 16x8 or 16x9 rears. 

One note, my car came with new tires so I am wanting to use them but the sizes are 205/55 front and 225/50 rear. To me, this means I need a 16x8 rear to fit "correctly" but I know guys run 225/50 on 9" rears successfully. My question is, from a dynamic perspective is one size preferable to another (meaning the 16x8 vs 16x9 rears)? Also, I believe they will look the same from the outside as the additional inch is on the inner portion of the wheels so looks should be equivalent correct?

Just trying to pin this all down before I pull the trigger on the rears. Appreciate any advice or feedback you may have, thank you.

 

Share this post


Link to post
Share on other sites

Maybe the sizes that came from factory can help:

SC 16": 6Jx16 front / 7Jx16 rear

SC RS: 7Jx16 front / 8Jx16 rear

Carrera 3.2 16" up to MY88: 6Jx16 front / 7Jx16 rear

Carrera 3.2 Club Sport: 6Jx16 front / 8Jx16 rear

 

8 hours ago, 786 said:

Also, I believe they will look the same from the outside as the additional inch is on the inner portion of the wheels so looks should be equivalent correct

For the 6, 7 and 8" Fuchs the ET is such that it is the *inner* edge of the wheel that remains in place and any growth is towards the outside.

Share this post


Link to post
Share on other sites
Quote
1 hour ago, WP0ZZZ said:

For the 6, 7 and 8" Fuchs the ET is such that it is the *inner* edge of the wheel that remains in place and any growth is towards the outside.

 

Is that correct - to be honest I can't quite get my head around the chart listing all the Fuchs wheels and where they sit on the hub relative to each other?

Share this post


Link to post
Share on other sites

225's on 9" wheels can look a little stretched especially if it's an R rated tyre.

If you search on Pelican someone has produced a chart explaining the offsets, widths, part numbers and the relation inboard/outboard spacing.

Share this post


Link to post
Share on other sites

I have 16" 7&8s on mine. Got them refurbed by Nick Moss at early911. I originally though that on a 9" wheel the entire extra inch was on the inside, but I seem to recall someone putting me right and saying there was a few mm on the outside too. I stuck with 205s and 225s for the tyres, they don't look stretched to me. Just don't buy the 944 8" Fuchs as these don't have the deeper dish of the 911 ones. Here's a gratuitous shot of my 8".

 

 

IMG_7339.JPG

Share this post


Link to post
Share on other sites
3 hours ago, WP0ZZZ said:

Maybe the sizes that came from factory can help:

SC 16": 6Jx16 front / 7Jx16 rear

SC RS: 7Jx16 front / 8Jx16 rear

Carrera 3.2 16" up to MY88: 6Jx16 front / 7Jx16 rear

Carrera 3.2 Club Sport: 6Jx16 front / 8Jx16 rear

Carrera CS followed the standard Carrera in terms of wheel size, eg the my87 cars came with 6 and 7s - the run out my88 cars came with 6 and 8s

Share this post


Link to post
Share on other sites

Yes indeed - that's the chart! So in summary offset changes with just about every size and "inner edge" varies in about 50% of cases too?

Share this post


Link to post
Share on other sites

I have 16x9 on the back of my narrow arch car, with 10mm spacers! I am not sure how it fits under the arch to be honest. 

225 section S02s they don't look stretched. I'd take a photo but the car is in the shop! It amazes me how much variation in width there is for tyres that are officially the same size.

Share this post


Link to post
Share on other sites
16 minutes ago, reddevil said:

I have 16x9 on the back of my narrow arch car, with 10mm spacers! I am not sure how it fits under the arch to be honest. 

225 section S02s they don't look stretched. I'd take a photo but the car is in the shop! It amazes me how much variation in width there is for tyres that are officially the same size.

That's quite some going to get those to fit into a standard narrow body car with 10mm spacers. My 8s with no spacers and 225s are close. Very close when you look at it on the rollers on a full power run with the arrrr5e squatting right down.

Share this post


Link to post
Share on other sites
18 minutes ago, reddevil said:

I have 16x9 on the back of my narrow arch car, with 10mm spacers! I am not sure how it fits under the arch to be honest. 

Same 10mm spacer on the blue IB but with 245 rear tyres, was more a visual thing for me to balance up with the 951 8's on the front which site further outboard.

1 minute ago, Kenny Senior said:

That's quite some going to get those to fit into a standard narrow body car with 10mm spacers. My 8s with no spacers and 225s are close. Very close when you look at it on the rollers on a full power run with the arrrr5e squatting right down.

Toe and camber settings make a big difference here.

Share this post


Link to post
Share on other sites

It's not the proximity to the lip that is a potential issue, it's higher up in the arch...

IMAG1829.thumb.jpg.1bc69bb34ff3d0257ee0d175e0385930.jpg

IMAG1825.thumb.jpg.7bffeacc85e470658a0ac08b2516ef46.jpg

This is with 16x9 + 6mm spacers and 245/45 track tyres and a fair amount of camber. It only happens at Brands hatch, going into the dip at the bottom of the slope after Paddock Hill bend.

I tried it without the spacers and it still happened, just a bit more patina :cool:

Mark

 

Edited by SilverWT

Share this post


Link to post
Share on other sites

Whoops. I can see the issue! My car is pretty stiff on the back, not too much camber though (1.5deg) and not too low. 

Share this post


Link to post
Share on other sites

Many moons ago when I was looking into changing my wheels I made my own spec list before the one above appeared 

 

Standard Fuchs (Fuchsfelgen)  Size Offset Backsize Part Number 
1984 -    6.0 x 16 36.0 mm 121 mm 911.362.113.00
Std 6J x 15 : 185/70 front, 7J x 15 : 215/60 rear 6.0 x 16 36.0 mm 121 mm 911.361.020.43
Std 6J x 16 : 205/55 front, 7J x 16 : 225/50 rear 7.0 x 16 23.0 mm 122 mm 911.362.115.00
Opt 7J x 16 : 205/55 front, 8J x 16 : 225/50 rear 7.0 x 16 23.0 mm 122 mm 911.361.020.44
1987 -   7.0 x 16 23.0 mm 112 mm 951.362.115.(944)
Std 6J x 15 : 195/65 front, 7J x 15 : 215/60 rear  8.0 x 16 10.6 mm 112 mm 911.362.117.00
Std 6J x 16 : 205/55 front, 7J x 16 : 225/50 rear 8.0 x 16 10.6 mm 112 mm 911.361.020.45
Opt 7J x 16 : 205/55 front, 8J x 16 : 225/50 rear 8.0 x 16 23.3 mm 135 mm 951.362.117.(944)
1988 -   9.0 x 16 15.0 mm 130 mm 911.362.119.00
Std 6J x 16 : 205/55 front, 7J x 16 : 225/50 rear        
Opt 7J x 16 : 205/55 front, 8J x 16 : 225/50 rear Size Typre options Off set
1989 -   6 x 16 205/55   6 J x 16 H2 - 36,0 mm
Std 6J x 16 : 205/55 front, 8J x 16 : 225/50 rear 7 x 16 205/55 : 225/50 7 J x 16 H2 - 23.3 mm
Opt 7J x 16 : 205/55 front, 8J x 16 : 225/50 rear 8 x 16 225/50 : 245/45 8 J x 16 H2 - 10.6 mm  
Tyre pressures - Front 2.0 bar (29psi), Rear 2.5 bar (36psi). 9 x 16 225/50 : 245/45 9 J x 16 H2 - 15.0 mm  
Turbo -          
Opt 7J x 16 : 205/55 front, 9J x 16 : 245/45 rear Upgrade    
Tyre pressures - Front 2.0 bar (29psi), Rear 3.0 bar (44psi). 7 x 16 205/55    
    8 x 16 225/50    
    9 x 16 245/45    

Share this post


Link to post
Share on other sites
9 hours ago, WP0ZZZ said:

For the 6, 7 and 8" Fuchs the ET is such that it is the *inner* edge of the wheel that remains in place and any growth is towards the outside.

 

7 hours ago, Magnum said:

Is that correct - to be honest I can't quite get my head around the chart listing all the Fuchs wheels and where they sit on the hub relative to each other?

If you look at the plot above for the 6, 7 & 8 x 16 wheels, the inner edge of the 911 tyres stays roughly in the same place. Another way to look at it is by looking at the ETs: they reduce by about half an inch for every inch of width increase. 

Share this post


Link to post
Share on other sites
5 hours ago, SP72 said:

Carrera CS followed the standard Carrera in terms of wheel size, eg the my87 cars came with 6 and 7s - the run out my88 cars came with 6 and 8s

I didn't know that. Thanks for pointing it out.

Share this post


Link to post
Share on other sites
6 hours ago, Kenny Senior said:

I have 16" 7&8s on mine. Got them refurbed by Nick Moss at early911. I originally though that on a 9" wheel the entire extra inch was on the inside, but I seem to recall someone putting me right and saying there was a few mm on the outside too. I stuck with 205s and 225s for the tyres, they don't look stretched to me. Just don't buy the 944 8" Fuchs as these don't have the deeper dish of the 911 ones. Here's a gratuitous shot of my 8".

 

 

IMG_7339.JPG

Beautiful, looks spot on. Any pics of other angles you could post?

5 hours ago, SP72 said:

Time for this to be deployed:

 

11A651EE-E65B-4C8D-A714-D00C18FD2E88.jpeg

This was very helpful, thank you.

4 hours ago, reddevil said:

I have 16x9 on the back of my narrow arch car, with 10mm spacers! I am not sure how it fits under the arch to be honest. 

225 section S02s they don't look stretched. I'd take a photo but the car is in the shop! It amazes me how much variation in width there is for tyres that are officially the same size.

I am amazed that fits, pics when you get it back please :)

 

If anyone has experience with both widths, did you notice any real difference between the two in terms of driving dynamics? 

Also, it seems from everything I have read in here that 16x8 might be the easiest to do and there are no obvious drawbacks in terms of fitting and they look great whereas 16x9 may be more difficult to fit in some respects but look a little wider/more aggressive? Anyone have 16x8 vs 16x9 wheel pics to compare the difference in look?

Thanks for all the help guys, this is a great forum! 

 

Share this post


Link to post
Share on other sites

16 x 7&9 here, R245x45 & F205x50.  I always thought 205x55 profile on the front look slightly fatter than the rears.  No clearance issues, I think the rear could stand 10mm spacers.

It's been that long since I swapped from 6&7s that I can't remember if the car felt different afterwards.  I'd imagine the difference would only be felt at the upper limits that you would really experience on a track.

 

28167951_10156121161276197_8699040238297841337_n.jpg

28235311_10156121149476197_6909588979038512531_o.jpg

Share this post


Link to post
Share on other sites

great pics guys, all the cars look so good this is becoming a harder decision than i initially thought lol

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×