awhile back i was advised that i have the wrong size tires on the rear of my
79 ( i have 225/60...I was advised that i should be running 255/50..well my
lovcal dealer doesnt stock them but they do stock the 275/50..will these be
ok for the rear?? and can i run the 225/60 on the front still?? i cant
imagine going to the bigger grips on the front because of turning radius and
larry in va beach
On Sat, 03 Sep 2005 17:14:13 GMT, "Larry & Michele"
====================From Memory >>>>>>>>>
and to be truthful Mine is not that good .
The stock Tire size from the factory was 225x70 ...
Today I have 235x60 on the car and to be perfectly honest that tire
does NOT fill up the wheel well ...looks stupid in fact... How does
your present tire look?
At one time I did run 255's on the rear but can not remember why I
removed them...since I had no problem on the rear...
using 50 series tires I THINK (BUT do not know) the wheelwell would
look almost empty...
I would ask your tire dealer the actual height of the tires...compare
that to what you have on the car now and then pull out the checkbook
if you need to...
Sorry to add this BUT my 79 (an L82 ) is an automatic and still would
have a hard time burning rubber even on gravel roads...why do you even
think you NEED such a wide foot print on the rears...
Actually I run 225x70 on both my 72 and 76 (both 4 sp cars) and still
have no need for wider rubber...
Hope this helps you a little...
64 & 72 Ragtops
76 79 & 95 Coupes
Bob is right about this.
Here is what you are looking at:
Years Stock Optional Common Replacements
1968 - 1972 F70-15 235/60 - 245/60-15
1973 - 1977 GR70-15 235/60 - 255/60-15
1978 - 1982 225/70-15 255/60-15
The F70-15 was wide compared to the 6.70 and 7.75 tires on the Sting Rays
when first introduced on the '68, although needed since they also used a
wider (7 inch) rim. In '69, they went wider to the 8 inch rim and the F70
was really a bit narrow, but was the right compromise for ride comfort, ride
height, speedometer correction, and so on. By 1973, bumper height laws
helped them go to the taller GR70-15 which also filled the wheelwell better.
In 1978, tires tired metric with the 225/70-15 and an optional 255/60-15
came to fill the need for a wider tire that was the common desire at the
time. In the '70s, it was quite common to see G60-15, H60-15, and even
L60-15 on Corvettes. With the low horsepower of the '78 and up cars, the
wider 255/60-15 was mainly for looks as they were not needed for
Since the chassis and basic body is the same, 255/60-15 tires began to
appear on earlier cars quite often. However, the emergency brake cable mount
on the trailing arm can rub and cut the tires with some makes and on some
years. Basically, the steel 8 inch Rally wheel sits in just slightly more
than the Corvette aluminum wheel. Aftermarket wheels tend to sit out much
more than Corvette wheels.
On the front, the inner lip was trimmed at St. Louis for those cars
receiving the 255/60-15 tires.
So you can get in trouble with larger tires on earlier cars if the wheel
combination is wrong. Aftermarket wheels often rub on front when turning as
they sit out more, but work at the rear since they don't rub the cable.
Being further out does tend to make the rear bearings go out faster.
Larry, here's my portion of the earlier thread ( tacking on my response
to Tom's reply to you):
I checked the thread but couldn't find any recommendation for the 255/50
size. 255/60 was the factory optional tire with 225/70 as standard
To fill the wheel well as it should be for appearances *and* to bring
your speedo back into the usable range, you need to do some math with
whatever tire you're looking at. The 50, 60, or 70 number in the tire
size is the side wall height as a percentage of tread width. For
instance if you reread what I posed above, you get a 157.5mm side wall
height by multiplying the tread width (225) by the percentage (70).
You're aiming for a 153mm to 158mm side wall height to match the
engineered factory specs without going to excessively wide tread or high
The two tires you spoke with your dealer about won't do you any good
with respect to changing the look of how the wheel/tire fills the well:
255/50s would only be 127.5mm tall in side wall (wheel rim to tread)
275/50s would only be 137.5mm in side wall height.
Neither one would do you any better than the tires you have right now
(135mm). You ought to be asking your dealer for the factory sizes of the
wider 255/60 or the standard 225/70.
Here's waving to ya - \||||
'67BB & '72BB
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