11" Wheel on Wide Body

[Peter-Paul]

I have a 1977 911S with a ‘Turbo’ widebody (9”/11”) – no Turbo components like brakes, trailing arm, etc. are in the car.
My plan is to assemble 11” Fuchs replica wheels in the rear (15x11, ET -27). I received a wheel (no tire) from a friend to try it out. To my surprise it extends the fender by a little less than an inch (22 mm) - measured with straight edge from the outside of the wheel to the outside of the fender, while the car is on jack stands.
I can not load the suspension at this time to see how the trailing arm would move, as I do not have an engine and transmission in the car.

I wonder if anyone could comment whether the wheel would tuck under the fender when the car is set on the ground with the engine installed?

Thanks
Peter

[Bill Verburg]

Originally Posted by Peter-Paul

I have a 1977 911S with a ‘Turbo’ widebody (9”/11”) – no Turbo components like brakes, trailing arm, etc. are in the car.
My plan is to assemble 11” Fuchs replica wheels in the rear (15x11, ET -27). I received a wheel (no tire) from a friend to try it out. To my surprise it extends the fender by a little less than an inch (22 mm) - measured with straight edge from the outside of the wheel to the outside of the fender, while the car is on jack stands.
I can not load the suspension at this time to see how the trailing arm would move, as I do not have an engine and transmission in the car.

I wonder if anyone could comment whether the wheel would tuck under the fender when the car is set on the ground with the engine installed?

Thanks
Peter

I'm confused does the wheel stick out too far or not far enough?

a Fuchs 11 w/ stock flanges and ET -27 has a front space of 175.6mm and a backspace of 121.6mm

and should fit the 930 fender depending on the tire and suspension spec

[Peter-Paul]

I was surprised that the wheel would extend the fender that far. I expected it to be about flush with the fender, or just stick out about a ¼” when it is jacked up.

I just want to make sure that I do not invest 4k in wheels and tires to find out that I have an issue.
As far as I can tell there are no modifications to the suspension and body.

[2.7RS]

Search for a thread here on pelican

I remember reading it. Someone trying to fit the 15/9 15/11 maxilites on wide body car.

I don't remember the exact specs of the build. Plenty of first hand info if you can find it

[Bill Verburg]

I was surprised that the wheel would extend the fender that far

That still does not clarify what you mean

is the wheel too far outboard?
or
too far inboard?

Additionally the tire and the tire specs will have a significant impact on fit


as does rude height and suspension spec

[Peter-Paul]

I would think it is too far outboard and might not fit under the fender.

[Jack Olsen]

If you're making a wheel, and can work out the offset, then there's a lot of room under there to work with.

[Peter-Paul]

Thanks Jack - I'd rather go with an available wheel

Bill - I intend to go with a Pirelli 285/40VR15. The ride hight could be adjusted if needed.

[gled49]

Original 11” wheels should fit with 911 trailing arms and a Turbo or RSR flair, the problem was with 930 trailing arms where the wheel flange is 2” wider. You are going to have to test fit wheels and tires at ride height.

[Bill Verburg]

Originally Posted by Peter-Paul

Thanks Jack - I'd rather go with an available wheel

Bill - I intend to go with a Pirelli 285/40VR15. The ride hight could be adjusted if needed.

The Pirelli 285/40 x15 will be very stretched on an 11.
wheel f/s is 176mm, the tire in that wheel doesn't stick out past the lip it's f/s is ~170mm

That wheel tire combo should fit but it sounds like maybe the flairs were welded on w/ a bit less depth than usual

to get some rough idea of maximum f/s get the hub about where it will be at ride height, drop a plumb line from the inner fender lip and measure from the plumb line horizontally to the brake disk face where the wheel mounts

That is the max f/s, again a stock Fuchs 11 will have a f/s of 176mm

It wouldn't hurt to measure the actual f/s of your wheel

here's a 285 Pirelli on an 11 on the left



for reference here's an 11x15 Fuchs ET27



This shows how to measure b/s f/s just goes the other way to the front of the wheel

[Peter-Paul]

Thanks for the details Bill. This is prretty much how I measured the wheel and how it fits. The dimesion match up pretty good.

I can not see or feel any welds on the inside of the fenders, so I do not know for sure whether they have been added later in the life of the car.
Do you have a dimension from the fender lip to the inner structure of the chassis - just to see if there is indeed an issue with the width of the fenders?

My thought on the Pirelli's is that I woud like to have a 'narrow' tire and with that have less rubber on the road. I will have a 3 liter carbureted engine assembled and I am reading that wide tires do not help the performance of the car.
Which tire would you recommend?

[Bill Verburg]

Originally Posted by Peter-Paul

Thanks for the details Bill. This is prretty much how I measured the wheel and how it fits. The dimesion match up pretty good.

I can not see or feel any welds on the inside of the fenders, so I do not know for sure whether they have been added later in the life of the car.
Do you have a dimension from the fender lip to the inner structure of the chassis - just to see if there is indeed an issue with the width of the fenders?

My thought on the Pirelli's is that I woud like to have a 'narrow' tire and with that have less rubber on the road. I will have a 3 liter carbureted engine assembled and I am reading that wide tires do not help the performance of the car.
Which tire would you recommend?

If it's a '77 911s then either 930 flares were added or the quarters were changed to 930 versions. The latter method won't leave visible seams

stock 930 outer edge at the lip is ~356mm from the inner wall
stock SC/Carrera is ~305mm

you are right to be concerned about overtiring the car w/ a stockish 3 liter

The Pirelli P7 Corsa Classic 225/595 is more like a 235/45 on an 8 and would be stretched to more like 247/40 on a 9 stock RSR 9 was ET3 front space is ~115mm

in back 285/40 on a 10.5 ET-27 is more like a 297/35 and has a f/s of ~170mm

These tires are also less block shaped than many, this provides a bit of extra room at the lip

[Peter-Paul]

Thanks for the dimension of the rear fender. I will measure that tonight.

I was thinking about the Pirelli Cinturato P7 285/40VR15 for the rear
285/40 YR 15 Pirelli Cinturato P7 - 285/40R15 Tires (lucasclassictires.com)
and the 225/50VR15 for the front
225/50 YR 15 Pirelli Cinturato P7 - 225/50R15 Tires (lucasclassictires.com)
Their tread appears to be more for street use.

In the front I was looking at a 9” rim with an offset of 15
5 spoke, 9x15, 300,00 $ (maxilite-wheels.com)
You mentioned an offset of 3. Do I look at this wrong?

PS: copy the underlined string into your browser to see the tires and wheel online

[Bill Verburg]

Originally Posted by Peter-Paul

Thanks for the dimension of the rear fender. I will measure that tonight.

I was thinking about the Pirelli Cinturato P7 285/40VR15 for the rear
285/40 YR 15 Pirelli Cinturato P7 - 285/40R15 Tires (lucasclassictires.com)
and the 225/50VR15 for the front
225/50 YR 15 Pirelli Cinturato P7 - 225/50R15 Tires (lucasclassictires.com)
Their tread appears to be more for street use.

In the front I was looking at a 9” rim with an offset of 15
5 spoke, 9x15, 300,00 $ (maxilite-wheels.com)
You mentioned an offset of 3. Do I look at this wrong?

PS: copy the underlined string into your browser to see the tires and wheel online

9x16ET 15 was the Fuchs used on the rear of a 930 and also fits the rear of an SC/Carrera

I believe that the a 9x15 ET15 w/ 225 to 245 tire should fit the front w/ 911 hubs and 930 fenders,

similarly 10.5ET-20 w/ a 285 +/- tires should fit the back w/ 911 trailing arms and stock 930 fenders, bit again AFAIK these are not available

The above are why many chose 17s, Fuchs clones are easily available w/ custom ETs for these


any way near as I have been able to determine 911 chassis w/ 930 fenders can accept ~110mm f/s in front and ~163mm f/s in back, this is usually tire f/s not wheel f/s, tire f/s is usually a bit larger than wheel f/s

[Rodsrsr]

I considered all of the above information for my build and decided to go with 17" Lindsay widened Fuchs. Tire availability is just too limited with anything else. Here's my car with 17x11 and 315/35/17 Nittos. Fantastic tire btw.

[tdw28210]

If it helps, my 1977 hot rod with stock trailing arms and turbo flares accepted the Maxilite 11x15's no problem. Haven't shopped wide 15" rubber recently, but went with Michelin TB15's.

[gled49]

Here is my 70S with RSR flares. Note wheel offset with late 930 front hubs and 930 trailing arms. 9’s & 11’s.

[Peter-Paul]

Thanks everyone for the nice photos. The wide wheels just look great.

@Bill
I have measured the width of the flares on my car and they match the 356mm that you mentioned below.

With everything that I hear the 11" rims should fit my car, even if it looks a little odd with the car jacked up at this time.

I will do a little more digging on the available rubber to make a decission on the 17" vs. 15"

[Sboxin]

Originally Posted by Peter-Paul

I have a 1977 911S with a ‘Turbo’ widebody (9”/11”) – no Turbo components like brakes, trailing arm, etc. are in the car.
My plan is to assemble 11” Fuchs replica wheels in the rear (15x11, ET -27). I received a wheel (no tire) from a friend to try it out. To my surprise it extends the fender by a little less than an inch (22 mm) - measured with straight edge from the outside of the wheel to the outside of the fender, while the car is on jack stands.
I can not load the suspension at this time to see how the trailing arm would move, as I do not have an engine and transmission in the car.

I wonder if anyone could comment whether the wheel would tuck under the fender when the car is set on the ground with the engine installed?

Thanks
Peter

We are running 10.5 x 17 wheels and they tuck under the rear turbo fender very close -
the hard part is keeping the tire off the front oil cooler lines - takes a few trial and
error with some different spacers. This is a photo of car on track with rear 315/35/17 Hoosier A7s . . .

There are some really nice cars posted on this thread - ours is a race car and not so pretty . . . :-))

Wish you the best on your build !

Regards,
Roy T

[Fixer]

9&11x15s ETs +15/-27mm
77s trailing arms.

I guess fitment could depend on whether you welded your turbo flares on correctly.

Matt




I mounted the smallest tire I could on each to help clear