coldfire

I posted in the wheels/tires section a few days ago but there doesn't seem to be much traffic in that section... (mods can close or move or combine it please?)

Anyway, question is in the title... I know it can be done but I know nothing about backspacing

Wheels in question are Cragar SS's (15" rim) Tires will be white-letter either 60 or 70 profile (i.e. I'm not looking to barely squeeze some huge drag radials in there, I just need to make sure the new set doesn't rub on the inside or outside height should not be an issue

Oh yeah--car is a '70 Cutlass S

2blu442

I think the width of the tire you plan to us is needed. I have some 10" wide rims that were fabricated with zero offset. 275/50/15's fit well on a 1971 Cutlass Supreme rear. I believe that was pretty close to a 10" footprint on those tires. If your running narrower tires than that I'd go with a smaller rim as the edge of the wheel would be sticking out further than the tread. I've run 255 width tires on 7" rims, I thought they looked good. My 2 cents worth! John

455man

There is another thread with exact tire sizes and rim offsets. I can tell you I have cragars like that and 295/50/15 will fit but will rub. 275/60/15 will fit. And I forget the largest size you can fit in there. The 275/60/15 still has room on both sides. Try a search.

Qwik71442

you will need 5.5" backspace for the 15x10" rim to fit. FWIW-I have used this combo with 295/50/15, 325/50/15 and 28x13.5 M/T's and they all fit fine on the 70-72 Body at least.

coldfire

Any chance of a link? I tried search and couldn't seem to come across it...

The backspacing on the 15x10 Cragars I'm looking at listed on jegs right now skip right from 4.25" backspacing to 6"

Probably 275/60/15 will be the rubber

This is pretty much the exact look I'm going for



Disclaimer: This ^ is NOT my Cutlass, this is owned by someone in the MN Olds chapter I don't know, I snapped this photo at the 2010 meet because I loved the wheels/stance... I blocked the license plate # so hopefully its cool that I'm posting someone else's ride

gearheads78

Those look like 15 x 8 with L60's in that pic.

coldfire

The shadow in the pic hides more of the wheel... they're pretty damn wide... I've seen the car a couple times and always thought they were 10 wide

That said, you could very well be right, my knowledge base in rims/tires is low

gearheads78

The reason I think that is how sucked in the sidewalls are.

coldfire

I gotcha... now that you say it, my untrained eye sees it--you are probably right then...

That may solve this issue since I can't seem to find the 10" wide Cragars with better than 4.25" backspacing anyway (my earlier post about 6" backspacing was only for a different bolt pattern)

But 4.25" on a 15x8" rim would fit just fine, (depending on tire size) correct?

If you had to make an educated guess, do you suppose that car's running 295/60's as opposed to 275/60 to get that wide-tire look?

gearheads78

Ihave never seen a 295-60 except maybe in a drag radial. If you want that exact look and don't mind a bias ply tire look at th M/T L60-15
A 275-60-15 radial will be close to too.

455man

https://classicoldsmobile.com/forums...gest-tire.html

my72olds

I know this is a old thread but incase anyone wanted to know I talked to Stockton wheels today about having my 14x7 bolt on centers made into 15x10 with 5.5 back spacing this price of 290 a wheel is for drum brakes its more if your going big disc on rear ..... I'm just doin my rears for now . I had two extra wheels. If they turn out nice ill do the front 15x7 or maybe 8 next year...
Anyone have any input on their work ? Have you had yours done?
The only thing Im not sure about is if anyone makes a nice deep beauty ring for the wide rims or will I have to run them naked? I don't think they will look too bad just color matched

Fun71

A few years ago I searched for deeper trim rings and found some on the net that I think were 3" deep, but I don't know anything about the fit or quality.

babs68

If you are talking about Stockton Wheels here in California, then I can say that the work they did for me was great. I had them make me some bare metal 15x7 smoothies for the 68 so I could get them powered coated.

You are correct that you will need 15 and up if you are going to disc brakes.

my72olds

Yea I had a feeling a set of trim rings for them will be really hard to find . Might just have to go without.