What the correct tire size to use on a C-3:225x70-15 or 225x60-15?

I'm pretty sure the 225/70-15 is the standard size. An optional size on the later C3's was 255/60-15. The 255's seem most common from what I see.

Rick in '78 I believe they changed the wheel wells to fit the 60 series tires. The earlier cars used the 70 series tires. Some say you can use the 60s on the earlier models but you may have to trim the wheelwell.

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"Down on the Boardwalk...

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I put 255/60/15 in the rear and 245/60/15 in the front. People have told me 255 in the front will be to close to the wheelwell. If you hit a pump while you are turning the tire can hit the top of the wheelwellcausing big repaires to the body 

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I have 255/60/15 on all 4 corners of my Vette. All works well even in tight turns.

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My 81 Has the Goodyear 225 70 R 15 front and back.  Good riding tire.   If your gonna hit a bump, do it streight on !!!!dskopp2010-03-29 19:22:09

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1968-1972 used F70-15...todays's reference size is P215/70R15.

My '71 big block car has 255/60/15s all around.  It also has freshly rebuilt suspension and new springs, which makes a big difference.

Larry

I too have the 245/60s on the front of the wifes car and 255s all around on my '81, but ours are all newer types cars so,.......no issues with these sizes.  

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Jimmy B.
Just can't wait to get on the road again.

 
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My tire guy say 225/75r15 are way better.   There 1/4 inch taller.  He says its got stronger side walls.    I havent tryed them yet.    I have 255/70r15 now.    there BF Goodrich.  There way better than the junk the car had when I got it.  

I have 225x70-15's on my car,and I saw a post here where someone mentioned 225x60's.So I figured I just check.With some of the micky mouse things I found done to my caar I wanted to be sure things were right.

I have no clearance issues with the 255/60 15's.  But I have major suspension upgrades, which gave me room for error in ride height adjustments.  Have not gotten to the stock version car yet so I do not know what issues I would have there.  Now I am curious if it is gonna be an issue.

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 Just thinkin guys.  I saw a post about spare tires. One of you said Gm  would not have made it so the flat wouldnt fit in the tire tub.   I tryed real hard  and a  225/70r15  wont fit.  HAD TO GO IN FRONT SEAT. I was mad too   You know a flat never happens at a good time.

Charlie, the tire tub on our Sharks have to be adjusted down a bit to fit a 225 sized tire in them, but they are all adjustable. In fact, your '81 is easier than my '74 to adjust. From '78 up, the tubs had a slotted front mount for the tub that can be slid down to fit the full-sized tire. The original spare was a space saver spare, so it was waaay smaller than the road tires to start with. The engineers designed the tub the drop down in order to fit the road tire in there in place of the space saver.
I had some pics somewhere that showed how to adjust the earlier tubs. If someone here has a '79-up owner's manual, they could copy & post the page in it that shows how to drop the tub down for the larger tire...


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Joel Adams
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    Thanks  Adam.   Ill check this weekend.   Boy was I mad, got all wet and dirty.   I need a new tub anyway  mine got hurt when the wheel came off.

My spare is a 225x70 -15 and it fit in the tub on my 75.Only problem I am going to have with that is my new tires are going to be Firestones.(The spare is a brand new BFG)Oh well

Firestones are the best, Rick! I love mine! ( although mine are 255/60-15 )

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"Down on the Boardwalk...

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    Hi ADAM    Just looked at my spare tire and read owners book.  The book says road tires have to be flat??   I cant see what you are saying.     I'm getting a used tub maybe it will work. 

  my new tires are going to be Firestones.(The spare is a brand new BFG)Oh well [/QUOTE] ebo2010-04-04 17:56:20

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Naw the bubba at the tire shop put the white letters on the inside,so if I get a flat you'll see the black walls

When I had the aluminum rims I had the white letters on the outside.

When I switched to the ralley rims I had them mounted so the white letters were on the inside.

KDADDY792010-04-05 19:40:47

[QUOTE=tinbender]Naw the bubba at the tire shop put the white letters on the inside,so if I get a flat you'll see the black walls[/QUOTE]

....... that feller sure gets around, looks like he spent some time with mine too.....


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On the 70 I have 245/60/15's.
Even though I took off 255's the new BFG's were just too big for the front wheel well and I went down to the 245's.
The 1975 may have a bigger wheel well, that I dont know.

The 73 has 225/70/15's.
The tires on the 70, (245/60's) look much better.

Hope that adds to the confusion!

Had both sizes on the Lukester - like em both!! 225/70s on currently - BFG TA Radials...

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I have 235 60's all around on my 69 and never had a problem.