325/50R/15 on a 68 ? Will they fit - Chevelle Tech
Wheels & Tires What fits what?

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post #1 of 22 (permalink) Old Oct 23rd, 18, 9:29 PM Thread Starter
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325/50R/15 on a 68 ? Will they fit

I apologize if this has been asked a thousand times, I did try the search but it didn't work.
Anyway, right now I have 275/60R/15s on the rear of my car which I believe is around a 28" tire. It looks like I have room for a wider tire, which to keep the 28" height, seems to be 325/50R/15. Will this tire fit my 68 SS ? if so, what is the recommended back space and I would guess you need a 10" wide rim.

Any advice is welcome
Thanks Joe

"... the very powerful and the very stupid have one thing in common. They don't alter their view to fit the facts, they alter the facts to fit their view." Dr. Who, 1977
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post #2 of 22 (permalink) Old Oct 23rd, 18, 11:03 PM
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Re: 325/50R/15 on a 68 ? Will they fit

Quote:
Originally Posted by NW68SSBBC View Post
I apologize if this has been asked a thousand times, I did try the search but it didn't work.
Anyway, right now I have 275/60R/15s on the rear of my car which I believe is around a 28" tire. It looks like I have room for a wider tire, which to keep the 28" height, seems to be 325/50R/15. Will this tire fit my 68 SS ? if so, what is the recommended back space and I would guess you need a 10" wide rim.

Any advice is welcome
Thanks Joe
It's going to be a tight fit, and worse is those tires expand more than a smaller sidewall tire. Need to get the backspacing right, and better if you'd use a smaller size rim. You'll probably need to roll/cut the quarter lip and pound the rear inner wheel well to fit it.

Good luck,
-Joe

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post #3 of 22 (permalink) Old Oct 24th, 18, 2:21 AM
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Re: 325/50R/15 on a 68 ? Will they fit

Quote:
Originally Posted by NW68SSBBC View Post
I apologize if this has been asked a thousand times, I did try the search but it didn't work.
Anyway, right now I have 275/60R/15s on the rear of my car which I believe is around a 28" tire. It looks like I have room for a wider tire, which to keep the 28" height, seems to be 325/50R/15. Will this tire fit my 68 SS ? if so, what is the recommended back space and I would guess you need a 10" wide rim.

Any advice is welcome
Thanks Joe
i doubt there is room for them at 12.8'' sidewall width.


i and several others are running 296/55r15 Click image for larger version

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with a 12.2'' sidewall width ; with 27.9'' diameter

https://www.jegs.com/i/Mickey-Thomps.../3454/10002/-1
it was a tight fit, your rear axle must be centered exactly under the wheelwells
i have mine on 15x8/5.5''bs ; the drivers side rubbed slightly, so i added 5/16'' billet spacers; no rubbing now

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post #4 of 22 (permalink) Old Oct 24th, 18, 8:53 AM
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Re: 325/50R/15 on a 68 ? Will they fit

The 10 inch rim will make it a tough fit if at all. I had those on a 10 inch rim (on a modifies 1965 Chevelle) and I think they were like 13.0-13.2 inches wide. You can pull you tire off and measure from the frame to the inner fender lip to give you and idea and then you got to add clearance. The 325 will be 2 inches wider so see what room you have. If you do run a 295 a 10 inch rim is nice as it plants the tire flat on the ground. With a 10 inch rim it will be like 12.2-12.4 inches wide with a 295. Check with tire manufactuers rim size requirements. The 295-50 is a nice tire as it still has a good height of 26.8 inches. Maybe someone with a 1968 can chime in for car specific. I agree with the guy above spacing it exactly will be tough if it can be done at all.
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post #5 of 22 (permalink) Old Oct 24th, 18, 9:41 AM
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Re: 325/50R/15 on a 68 ? Will they fit

I tried it on my 71 and it did not fit without modification. You will need to roll the quarter panel lip in first and then you will need a lot of backspacing on your rim and that will hit your lower shock mounts. As mentioned your rearend must be absolutely centered perfect for any of this to work and most of our 40 year old chevelles are not. Also your choice of tire will also come into play. Some brand of tires expand more than others. You could get everything nice and after you heat up the tires they could rub. That is what happened to me. A 295/55/15 on a 15x9 worked for me with no modifications.
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post #6 of 22 (permalink) Old Oct 24th, 18, 8:09 PM Thread Starter
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Re: 325/50R/15 on a 68 ? Will they fit

thanks for all the advice

I wanted to stay as close to 28" diameter as possible because thats what my converter was spec'd at. It looks like the 295/55R/15 will be the winner.

Here is a picture of what I have now...the 275/60R/15.

I will take the tire off and measure both sides frame to fender and see what I end up with. One thing for sure I just got it painted and I'm not interested in beating up or rolling the wheel lip.

Thanks again,
Joe
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"... the very powerful and the very stupid have one thing in common. They don't alter their view to fit the facts, they alter the facts to fit their view." Dr. Who, 1977
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post #7 of 22 (permalink) Old Oct 24th, 18, 10:01 PM
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Try this calculator https://tiresize.com/comparison/
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post #8 of 22 (permalink) Old Oct 25th, 18, 10:15 AM
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Re: 325/50R/15 on a 68 ? Will they fit

I ended up with 295/65-R15 because I wanted to fill up the opening. 15x9 wheel with 5.5 BS. I have good clearance at my fender lip but had to pound on a couple of places on my lower inner fenders or it would rub slightly when cornering. I also had to grind the edges of the bolts on my lower shock mounts for wheel lip clearance. No way would I try anything bigger.
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post #9 of 22 (permalink) Old Oct 25th, 18, 8:22 PM Thread Starter
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Re: 325/50R/15 on a 68 ? Will they fit

Quote:
Originally Posted by any4xx View Post
I ended up with 295/65-R15 because I wanted to fill up the opening. 15x9 wheel with 5.5 BS. I have good clearance at my fender lip but had to pound on a couple of places on my lower inner fenders or it would rub slightly when cornering. I also had to grind the edges of the bolts on my lower shock mounts for wheel lip clearance. No way would I try anything bigger.
What does that end up to be height wise? and width?
Thanks Joe

"... the very powerful and the very stupid have one thing in common. They don't alter their view to fit the facts, they alter the facts to fit their view." Dr. Who, 1977
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post #10 of 22 (permalink) Old Oct 25th, 18, 9:33 PM
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Re: 325/50R/15 on a 68 ? Will they fit

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Originally Posted by NW68SSBBC View Post
What does that end up to be height wise? and width?
Thanks Joe
Advertised height is 30.3 and section width is 12. I run them at 18 PSI so the rolling radius is more like 14.5. Section width does run right at 12.
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post #11 of 22 (permalink) Old Oct 25th, 18, 11:40 PM
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Re: 325/50R/15 on a 68 ? Will they fit

Micky Thompson lists their 325/50-15 as requiring a minimum 8" wheel so that may help your fitment.

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post #12 of 22 (permalink) Old Oct 26th, 18, 12:13 AM
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Re: 325/50R/15 on a 68 ? Will they fit

Buddy runs the 295/55/15 MT DR's on 15x10's...5.5" bs. Perfect fit.

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post #13 of 22 (permalink) Old Oct 27th, 18, 3:10 PM
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Re: 325/50R/15 on a 68 ? Will they fit

See in My Garage 1st Album Pic # 22





Strip Rears
Wheels I - JEGs Sport Stars # 555-66086 15" x 10" BS= 5.5"
Tires - M/T ET Street S/S # 3454 295/55/15 =
27.7 Dia. / 10.6 Tread Width / 12.2 Sidewall Width / RO 87


67 Chevelle Malibu SS Cdn
Born 283 / PG / A51
468/TH400 2,500 stall/ S60 3.70 Gs
Prev Best on M/T ET S/S #3454 street Tires/Dress 2018/05/20
60' = 1.664
1/8 = 7.532 et / 91 mph
1/4 = 11.814 et / 115 mph
NEW Best with 3,500+ Stall TC 2019/09/08
60' = 1.547
1/8 = 7.311 et / 91.76 mph
1/4 = 11.595 et / 114.28 mph


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post #14 of 22 (permalink) Old Oct 27th, 18, 8:13 PM Thread Starter
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Re: 325/50R/15 on a 68 ? Will they fit

Quote:
Originally Posted by Kirk's67SS View Post
See in My Garage 1st Album Pic # 22





Strip Rears
Wheels I - JEGs Sport Stars # 555-66086 15" x 10" BS= 5.5"
Tires - M/T ET Street S/S # 3454 295/55/15 =
27.7 Dia. / 10.6 Tread Width / 12.2 Sidewall Width / RO 87

Sweet looking ride ! It doesn't look like you could fit much more tire in there.

Thanks Joe

"... the very powerful and the very stupid have one thing in common. They don't alter their view to fit the facts, they alter the facts to fit their view." Dr. Who, 1977
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post #15 of 22 (permalink) Old Oct 28th, 18, 8:17 AM
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Re: 325/50R/15 on a 68 ? Will they fit

I think also it depends what you are doing with the car. Are you doing any handling stuff because you need extra clearance for that. As we all know these cars the rears aren't always centered and roll a bit when going around corners.
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