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what tire size would be better?

Forum: C3 Engines, Driveline and Handling

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what tire size would be better?

Posted: 11/9/06 12:01pmMessage 21 of 32
c
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Mystic, CT - USA
Joined: 1/12/2006
Posts: 69
Vette(s): 1970 350cid/350hp 4 speed Mulsanne Blue/blue interior, convertible/white top, original engine, PS, PB, rally wheels.
I have 225/70 R15 Goodyear Eagle STs on my 1970.  I think they look great.  I like the big mean tire look and have had no problem with rubbing.  As far as handling I have nothing to compare it to as I got the car a year ago.  I need to replace them next year unfortunately.  I love the look but eagle st's are discontinued so am considering another Goodyear tire or Bf Goodrich radial TA's.
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what tire size would be better?

Posted: 11/9/06 3:31pmMessage 22 of 32
L
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Easton, PA - USA
Joined: 11/6/2003
Posts: 232
Vette(s): 1973 Coupe 350 Auto.T-Tops L48,65450 miles.
 Jim I have Grand Touring springs in the front and a new steel spring in the rear.
 
   Dave
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what tire size would be better?

Posted: 11/9/06 3:36pmMessage 23 of 32
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Willow Grove, PA - USA
Joined: 10/27/2006
Posts: 232
Vette(s): 1974 Stingray Coupe LS4 454 Dark Brown Metallic with Deluxe Saddle interior
and how do you like it?
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what tire size would be better?

Posted: 11/9/06 7:03pmMessage 24 of 32
L
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Easton, PA - USA
Joined: 11/6/2003
Posts: 232
Vette(s): 1973 Coupe 350 Auto.T-Tops L48,65450 miles.
 It rides a little stiff but handles great. I put a rear sway bar on her last year cause she didn't have one, and that really hooked her up. I'm running 28 PSI in my tires now but I'm gonna try 25PSI that will make her ride better. The GT coils are a little thicker wire diameter than stock and eliminate like 98% of the body roll.
 
  Dave
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what tire size would be better?

Posted: 11/9/06 7:54pmMessage 25 of 32
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Willow Grove, PA - USA
Joined: 10/27/2006
Posts: 232
Vette(s): 1974 Stingray Coupe LS4 454 Dark Brown Metallic with Deluxe Saddle interior
did it alter the ride height much?
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what tire size would be better?

Posted: 11/10/06 7:06amMessage 26 of 32
L
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Easton, PA - USA
Joined: 11/6/2003
Posts: 232
Vette(s): 1973 Coupe 350 Auto.T-Tops L48,65450 miles.
 I belive it raise the car up about 1 in. I would have to check my records out the garage. After all it was the original springs since 73. My rear spring was flat before I put the new one in, now it has some arch.
 
  Dave
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what tire size would be better?

Posted: 11/23/06 8:14pmMessage 27 of 32
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CUYAHOGA FALLS, OH - USA
Joined: 12/2/2003
Posts: 6424
Vette(s): 1975 C3 Red, T-Tops, Black Interior. All I need is time and money! Getting there!
The original size tires were F70-15.  
The closest replacement is 215/70-15, not the 225 /70-15 most people think.   This took a lot of research on my part to find the correct numbers.
I have 255/60-15 which is almost the exact same diameter as the original F70-15, but much wider.
 
Any pre 78 car may rub with the 60s.  After 78 they should not rub.   They do not rub on my 75, but this is a car by car thing.
 
Any sagging suspension will make a lot of difference.
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what tire size would be better?

Posted: 12/12/06 3:22pmMessage 28 of 32
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Houston, TX - USA
Joined: 2/25/2003
Posts: 193
Vette(s): 1971 LS5 Convertible 4 sp
[QUOTE=jrflyboyVP2]I believe 225 70/15's are the OEM tire size equal to the old GR70/15 size.  [/QUOTE]
I believe 215/70R15 are the closest size from the original 70/15.
 
I went with 225/70R15 and it fits well although I don't have much room. At least it doesn't rub.
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what tire size would be better?

Posted: 12/21/06 1:24amMessage 29 of 32
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Naples, FL - USA
Joined: 2/26/2005
Posts: 133
Vette(s): 1976 coupe with a custom body and a 396 big block with nitrous installed. Runs great!!
Do you have stock wheels or aftermarket? You may want to check the back spacing to see if they are letting the tire come to close to the frame when you turn. A deeper back space will bring the tire closer to the frame and visa versa with smaller back spacing. Check from the inside of the wheel to the mounting flange where the bolt pattern is. If it is deeper than stock (if you have other type wheels)then you may have tire rub.
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what tire size would be better?

Posted: 12/21/06 9:15pmMessage 30 of 32
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VENTRESS, LA - USA
Joined: 10/8/2003
Posts: 87
Vette(s): 1971 Blue Roadster, sb400, cam, electronic ignition,10 disc CD changer, 2.5" chambered exhaust, 3.36 rear,tremec 5 speed from Classic Chevy, fiberglass rear spring and vintage air.
I have the firestone 225-70's front and 255-70's in rear on stock 8 inch rims and no problems.

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