[Greg Reid]

I want to get a little more width in the rear and fill the wheelwells just a bit. I'm running 215/70R15s on a 6" rim. Let's say for the sake of discussion I stick with that tire size. Will simply going to a 7" rim give me the appearance of more tire?
What would be the proper backspacing? I'm looking at these-
http://www.ebay.com/itm/GM-15-x-7-St...BVrU55&vxp=mtr
I would consider doing the same on the front but I'm on the verge of scraping in diving turns up there already.
This is what it looks like with the 6" rims.

[SmallHurst]

For each inch increase/decrease of rim width, your section width will increase/decrease .5". For a 15" rim you could easily go 235/60/15-- F60-15.

[David Jones]

My fronts are 15X7" with 215/70-15's.

[Greg Reid]

Thanks for the info guys. That helps...I just need a decision pill.
I have 15x8 Rally IIs that I was running before the steelies and occasionally I would get a scrub on the front wheel in hard turns like going into my inclined driveway... I noticed that it never happened again after I went to the steelies and the only difference I know of is the width is 6" vs 7". Maybe the backspacing is different? Maybe the springs are going south. I dunno...
I may install them for a day or two just to check before I decide if it's safe to go all around with a bigger steel wheel/tire combo. I definitely want bigger at least in the back though.

[gtomike1967]

Here is a pic of the front wheel on my 67 GTO. Its a P215/65R15. As you can see it rubs on the back of my wheel well during sharp turns. Will a 60R15 fix it or do I need to go with something different?
[IMG][/IMG]

Thanks!

[Greg Reid]

That's the same place mine hits. I'm hesitant to go any wider than what I have now on the front.
DAVID, do you know what the backspacing is on your Cragars?

[amcmike]

Originally Posted by gtomike1967

Here is a pic of the front wheel on my 67 GTO. Its a P215/65R15. As you can see it rubs on the back of my wheel well during sharp turns. Will a 60R15 fix it or do I need to go with something different?
[IMG][/IMG]

Thanks!

Do you happen to know how much caster you're running?

[gtomike1967]

AMCMike, I don't really know what "caster" is so I cant really answer your question. I assume the front suspension is stock but I really don't know. I see people posting about running 15" wheels so im a little surprised that mine rub so much when I don't really think the tires are that big?
Thank you

[The Champ]

gtomike

I used to run 215/65/15's on my '64 with 15x7" factory rims (4.25" BS) and never had a problem with my stock drum brakes. I eventually went up to 235/60/15's and still everything cleared.

After switching to disc brakes up front, I occasionally get a very slight rub at the front of the wheelwell when making sharp turns.

It would be interesting to learn what your rim specs are - width and backspacing.

Going to a 215/60/15 is going to make your front tires pretty short - 25.2" vs 26" for your current 215/65's. My 235/60's are 26.1".

[amcmike]

Originally Posted by gtomike1967

AMCMike, I don't really know what "caster" is so I cant really answer your question. I assume the front suspension is stock but I really don't know. I see people posting about running 15" wheels so im a little surprised that mine rub so much when I don't really think the tires are that big?
Thank you

Here's a site that explains caster http://www.vikingspeedshop.com/suspe...aster-and-toe/

If someone tried to dial in a lot of positive caster with factory upper control arms, then it would put the tire closer to the fender lip (hence my question). If that were the case, you have two options: Have an alignment shop reduce caster (this will be a trade off in handling as you'll notice in reading the link), or purchase lower control arms with built in additional caster (such arms will pull the wheel more forward and add even more positive caster). I think GlobalWest and DSE make lower control arms with built in added caster. They also use Delrin solid bushings which will further improve handling, and actually improve ride as well.

[71HOT/A]

17x9 honeycombs with Nitto 555's 255/45 front, 255/50 rear. Stock springs and everything clears real well.http://www.forums.maxperformanceinc....1&d=1461435703

[shedgpeth4]

Originally Posted by 71HOT/A

17x9 honeycombs with Nitto 555's 255/45 front, 255/50 rear. Stock springs and everything clears real well.http://www.forums.maxperformanceinc....1&d=1461435703

cool car man dig the style

[shedgpeth4]

9's in back 8's in front on Nitto rubber. 285's in back i think 235's front.

global west long travel coil overs / tubular a-arms.

[71HOT/A]

Thanks, sharp '68 you have there.

[cruzingratiot]

1963 Pontiac Grand Prix
front and rear same
15x7 tru spoke supreme rims 3 5/8" backspace
205-70-15 firestone fr720 ww tires
2 in lowering springs from eaton spring Detroit MI

[62cat]

Nice. perfect stance on a very nice 63.

[The Boss]

Love this!




Retro here...

[hdpontiac]

i posted this on the forum in different threads and got no replies so I'm trying this thread I have a 1969 gto with 15x5 front and 15x8 rear the rims are weld rims front is 3-1/2 back spacing and rear is 4-1/2 back spacing I like to run street tires on the car I need to get the correct front tire with no issues of rubbing the rear is 275-60-15 any help is appreciated

[Old Blue 66]

17X8 Foose Knuckles all around. 4 1/2 BS.
Nitto 245/45 and 255/50.
They fit perfect

[fyrffytr1]

67 GTO with 17" YearOne rally IIs, 4.5" backspacing. Tires are 235/50R17 Eagles. I had to trim the rear fender lip flush with the wheel well trim and raise the car 1" for clearance. This is with the stock 67 rear end.
I also had to work on the fronts a little. There is a bump out in the back of the driver's side fender liner that I had to use a hammer on and I had to loosen the back fender bolts and ease the fender out a little for clearance.