What is the biggest turbo wheels you can fit?

[klober23]

what is the biggest turbo wheels you can fit under a 1976 911 with 9 & 11 inch flares? 17? 18? Wheel width? Thanks

[Scooter]

Many drivers on this forum will tell you that there is a big difference between "can" and "should". Just because you can go large diameter wheels, does not mean that you should. Most will say don't go larger than 17", otherwise the wheels will overpower the car visually. You have large flares, so overpowering may not be an issue. Also, NA cars with a 3.0 or 3.2 may not be able to push the heavier wheel, but you have a turbo, so this should not apply to you as much. If you go to the Fikse.com website, they have a picture of a turbo with 18" FM10's that looks sharp. Also, you need to consider offsets. You may be able to fit a wider wheel if the offset is correct. Someone here will post an offset chart hopefully. Good luck!

[Lukesportsman]

Ride heigth is a critical measurement here. That will help determine overall diameter of tire you'll choose from. Purpose? Pose (and I don't mean that negatively...but look cool) or Performance or Race. Slip angle is a concern with too big of a rim with older suspensions. Ride harshness maybe an issue and is related but independent to supsension stiffness (IMSA, LeMans vs. Nascar, F1).

Are you willing to roll fenders?

I also think it somewhat depends on your generation to the subjective answer of appearance. I'm on the fence growing up owning Muscle cars, but during a time Detroit started producing positive offset performance rims. Old school are more likely to like 15-16 with dish or lip in the rim. New school (25 and younger) are more likely going to lean towards the TOCA look (see much nicer than saying "ricer") with max diameter pushed offset to the edge of fender. Would any of you have liked a Porsche or Mustang with 19" or 20" rims 15 years ago....I would say no, but things do grow on you over time.

How much are you willing to spend to keep the weight of the assembly down? Speed as always cost money, and if you go big you might want forged or mag. Balance unsprung weight vs. added traction. Race Miatas don't run big OEM and do you see MiniCoopers running 14"?

[Kevin Stewart]

I disagree with scooter, as long as the diameter of the tire stays the size the wheels can be a 17-18-19 etc i had 18x10's on a sc with a stock 3.0 the car was fine

17's you can get a good ride dont have to change speedo, and you can get any width you need up to 335/35 for say 12" plus rear wheels

18's, i feel these with the altra small sidewall just plain ride rough, no speedo problems, but make the car handle like a slot car

19"s your changing tire diameters and will probably have to redo the speedo again 17 18 19 you can get tires sizes for up to 12" wide rear wheels, but expect to pay a premium,

15"s are really getting hard to find any tire, 16's are starting to be the same for ultra wide tires, besides with the big sidewall they roll over and dont handle as good as a 17"

back to what i think is your question it would be best to call a wheel dealer, but im pretty sure you can go 10's front 12's rear, but with a good wheel dealer you maybe able to even add an inch or two with that, Kevin

How about 22" ree-ums?

[RarlyL8]

Fitting the wheels is rarely the problem. It's fitting the TIRES.

For a turbo you can go 10" wide front, 12" wide rear on the rims IF the offset is correct and the tires are complementary to the package.
Diameter makes no difference. The aspect ratio of the tire vs width are the only concerns once the wheel has been chosen.

Example: A 235mm tire will easily fit in the front on a 10" rim. A 285mm tire on the same rim may rub.

The hot setup for the rear is 315mm tires. I have 345mm on mine. They fit but you have to tweek a few things to make it work.

[Jack Olsen]

I run 315's on 11-inch rear wheels. They're 17's -- although as Rarly and others point out, the diameter of your tire is what's important, not the wheel.

[IROC]

A friend of mine runs 9 and 11x17s with 275/40-17s and 335/35-17s.

Just a data point. No personal experience. Just envy.

Mike

[geof33]

Originally posted by JackOlsen
I run 315's on 11-inch rear wheels. They're 17's -- although as Rarly and others point out, the diameter of your tire is what's important, not the wheel.

Ok Jack... that's just not fair!!!

[lomotpk]

Fikse 17x9.5x11.5
255 in the front, 315 in the back.
930 standard flares. Fits, but tight. Check your oil lines

[Scooter]

Originally posted by Kevin Stewart
I disagree with scooter

Kevin, I actually don't think you disagree. My point was, just because you "can" put 19's on your car, that does not necessarily mean you "should". I have yet to see a 930 with 19's, but hey to each his own. I think most on this forum would agree that 18" is as large as one would want to go on a 930, and most would not go above a 17". Your post seems to indicate that if you go above an 18" wheel, then you may run into issues, which I agree. I think we are on the same page and I agree with your assessment.

[Bill Verburg]

This guy knows a thing or 2 about 930 wheels

I now have Michelin Pilot sport 255/35 on 18x9 front and 315/30 on 18x11 rear. No rear spacers, studs cut before I bought car, euro ride height. Only rubs on washer bottle in front a little bit. No problem with tire diameters.

Alan Baylis
Sales manager- Kinesis Motorsport

[81 930]

Although you can go with 18 or 19 inch wheels on a 911, most of the cars I have seen just do not "look" right to me. I think this is mainly due to the fact a lot of people run later model 993 and 996 wheels which have major differences in offset and then they end up using 2 or 3 inch spacers to get them to fit properly. Blech.

That being said, I am going with 17 x 9.5 fronts and 17 x 11 rears with 275/40 and 315/35 tires. The only real issue with going to 17s is the lack of tires identical in diameter to the stock tires; roughly 24.7 inches. All 17 inch tire sizes are slightly larger in diameter by anywhere from .25 to 1.0 inches which will effect your speedometer and acceleration slightly. The popular 18 inch tire sizes of 235/40 and 285/30 are more closely matched to the stock diameter. Just something to think about.

Here are some recent shots of my 930 undergoing some upgrades at TRE for reference:

[ZCAT3]

Originally posted by IROC
A friend of mine runs 9 and 11x17s with 275/40-17s and 335/35-17s.

Just a data point. No personal experience. Just envy.

Mike

I have 17 inch 8.5 x 11 Kinesis K28s I use for the track on my 930. The tires are similar size to what Mike lists above. I had several minor issues that I had to address. The front driver's wheel rubbed the washer fluid resevoir so I had to pull that out and reshape it (I used a heat gun to get the plastic pliabel and then reformed the bottle). I also had to grind down the rear spring plate studs a bit (where they stick out past the nut). Finally I had to fabricate a brakcet to pull the soft oil return line from the external T-stat to the oil tank in a bit as it was also contacting the tire under cornering.

I could see fitting 9s up front, but I think it may cause more issues than it is worth. 8.5 gives plenty of grip. I guess my point here is that running wheels this large on these cars will certainly create some issues. No one should think they can put 9x18 wheels in the front of their Carrera and they are good to go. These large wheels will also put a lot more stress on your wheel bearings (I have already had to replace the rear wheel bearings).

[Jim2]

Klober23, I'm with 10 and 12 x17. These seemed to be the widest 17s I could fit. I noticed some people cram in wider rims but sacrafice optimal camber and fender lip structure, all for? I only use these rims on the track because they suck on the street where I live. At 10/12 I had to be bang on with offset to avoid mods or thin shim spacers which don't provide hubcentric. ZCAT3 mods give more steering lock. - Go for it!

Jim
Project 911 http://www.members.shaw.ca/kremer/930.htm

With 10/12x17 and 255-40/315-35...

[89turbocabmike]

Check out Pelican ted's turbo-look at this thread for last year with oil line relocation:

335/35/17 on a Turbo look.