Tire sizes for a sc wide body

[Kevin Stewart]

Hi everyone I am going from 18s to 17s I know you may think I’m crazy but it rides horrible I am putting 17x11 and 17x9 wheels on I’m gonna use 315/35/17 on rear and tentatively 255/40/17 on the front I am concerned about city driving and that big of a tire on the front of my sc wide body with no power steering. What do you think pictures a plus. Kevin

[Uwon]

Still too much tire imo. Too much unsprung weight will result in noisy and harsh ride. Hard parking too.
Years ago I had a set of 964 17’ on my ‘86 which worked really well both on lousy Toronto streets and highway. Maybe add spacers to fill out the fenders.
M2CW
Good luck.
Johan

[RarlyL8]

That's the combo I used on my widebody SC for over a decade. Yes they feel a bit heavy due to the sub 200WHP 3.0L SC engine but not that big of a deal. The car hit redline top end (145mph) all the time (I lived rural) and handled very well with all that grip. I kept that combo when the turbo engine was installed and have that combo on my 930 now. Had 255/345-15 on a widebody '73 back in the day. None had power steering, to me it's not a problem at all and worth it for the look.

[Kevin Stewart]

Originally Posted by RarlyL8

That's the combo I used on my widebody SC for over a decade. Yes they feel a bit heavy due to the sub 200WHP 3.0L SC engine but not that big of a deal. The car hit redline top end (145mph) all the time (I lived rural) and handled very well with all that grip. I kept that combo when the turbo engine was installed and have that combo on my 930 now. Had 255/345-15 on a widebody '73 back in the day. None had power steering, to me it's not a problem at all and worth it for the look.

I have a 3.6 shouldn’t be a problem

[Kevin Stewart]

Originally Posted by Uwon

Still too much tire imo. Too much unsprung weight will result in noisy and harsh ride. Hard parking too.
Years ago I had a set of 964 17’ on my ‘86 which worked really well both on lousy Toronto streets and highway. Maybe add spacers to fill out the fenders.
M2CW
Good luck.
Johan

I am taking the 18s off the purpose of the wheel change is to get ride of spacers

[Sboxin]

We use the rear size 315 but 245 on the front -- 245 Hoosiers run a little wide . . .
I'm not sure what you have -"SC Widebody" ?
We have Turbo flares on 1978 SC body race car . . .
Photos added that may help - - wheel offset and spacers are pretty much trial and error . . .
RarlyL8 has some great photos of his car if you do a search . . .

We do have some tire rubbing - for the street you might consider a size smaller both front and rear . . .

Regards,
Roy T

Originally Posted by Kevin Stewart

I have a 3.6 shouldn’t be a problem

"That's the combo I used on my widebody SC for over a decade. Yes they feel a bit heavy due to the sub 200WHP 3.0L SC engine but not that big of a deal. The car hit redline top end (145mph) all the time (I lived rural) and handled very well with all that grip. I kept that combo when the turbo engine was installed and have that combo on my 930 now. Had 255/345-15 on a widebody '73 back in the day. None had power steering, to me it's not a problem at all and worth it for the look.
__________________
RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8 "

[Kevin Stewart]

Originally Posted by Sboxin

We use the rear size 315 but 245 on the front -- 245 Hoosiers run a little wide . . .
I'm not sure what you have -"SC Widebody" ?
We have Turbo flares on 1978 SC body race car . . .
Photos added that may help - - wheel offset and spacers are pretty much trial and error . . .
RarlyL8 has some great photos of his car if you do a search . . .

We do have some tire rubbing - for the street you might consider a size smaller both front and rear . . .

Regards,
Roy T



"That's the combo I used on my widebody SC for over a decade. Yes they feel a bit heavy due to the sub 200WHP 3.0L SC engine but not that big of a deal. The car hit redline top end (145mph) all the time (I lived rural) and handled very well with all that grip. I kept that combo when the turbo engine was installed and have that combo on my 930 now. Had 255/345-15 on a widebody '73 back in the day. None had power steering, to me it's not a problem at all and worth it for the look.
__________________
RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8 "

I think the 315 on the rear will be fine but they are still 9 inch from it’s a street car but I rarely drive it 82 sc turbo fenders the Wherls are 5.5 rear spacing front and rear I should get them today the were on another sc wide body zuchs

[wildcat077]

Kevin,

There's a guy selling a nice set of 17 inch Fikse FM10's off a wide body 911 for a great price on the UCR PCA region classifieds.They come with near new tires on 9 and 11 inch wheels.

Might be worth a look ...

[Kevin Stewart]

Originally Posted by RarlyL8

That's the combo I used on my widebody SC for over a decade. Yes they feel a bit heavy due to the sub 200WHP 3.0L SC engine but not that big of a deal. The car hit redline top end (145mph) all the time (I lived rural) and handled very well with all that grip. I kept that combo when the turbo engine was installed and have that combo on my 930 now. Had 255/345-15 on a widebody '73 back in the day. None had power steering, to me it's not a problem at all and worth it for the look.

Is your car lowered my car is factory lowered I am worried about the front rubbing

[Bill Douglas]

Originally Posted by Kevin Stewart

I am taking the 18s off the purpose of the wheel change is to get ride of spacers

Jeeze, Kevin, life is all about looks and that car is beautiful. If I was to make any changes I'd lose the wing/whale tail thing. Love the color too.

[Kevin Stewart]

Originally Posted by Bill Douglas

Jeeze, Kevin, life is all about looks and that car is beautiful. If I was to make any changes I'd lose the wing/whale tail thing. Love the color too.

The spacers have got to go. I thought about taking the spoiler off

[RarlyL8]

Here's a pic of my SC widebody with 9&11.5x17 255/315 combo. Typical Euro height.
If deleting spacers the back spacing would be 5.5" front and rear. I had 18's on this car as well as 15's at one time. The 15's felt the most heavy and the 18's felt the most light. I believe this was due to the sidewall height / aspect ratio. 17's looked the best IMO.