<VV> 14" to 15"wheels

[Jim Davis]

Generally correct.  The FC wheels are 14x5 jmod where as the car wheels 
of the time were 14x5jj.  It is stamped near the valve stem on all 
wheels after 1973.  The first j came about with the popularity of 
tubeless tires.  It denotes a safety rim or that there is a lip in the 
tire bead area of the rim to retain a flat tubeless tire.  Before that 
modification, the tube helped retain the tire on the rim.  The second j 
denotes the size and location of the center depression in a solid rim.  
A split rim would not have this designation.  The mod description 
indicates that the FC rim doesn't meet the standard j specifications; 
that is, the depressed center section is not centered in the rim.  This 
is why the tire can only be removed or installed from only one side of 
the wheel.

  Note: 15x6jj rims fit FCs just fine but 225/70-15 tires do rub the 
front ADDCO anti-roll bars at full steering lock.
Jim Davis


On 8/8/2012 11:58 AM, BBRT wrote:
> For those that don't know, the FC uses a stock steel wheel that has a a
> different back space than the run-of-the-mill GM wheels that used to be
> common in salvage yards. The tie rod end is very close to the rim. Therefore
> the concern about interference of rubbing or hitting the tie rod end,
> regardless of rim diameter. "Regular " GM wheels fit the FC rear.
>
> By the P & A 30 Parts Manual, the FC wheel is a 14 x 5J (9/16th offset) #
> 3960336. Early and late models Corvair cars are listed as 13 x 5 1/2 Early,
> 13 x 5.5 Late. "J" is an SAE code for the rim designation, I believe.
> Anyone?
>
> Chuck S