On my 88 rxz non-turbo my rims are 15 inch, what it says directly on the rim is 6JJx15, but then in another space it just says 16 and on my front rims it says 6JJx15 and in the other space it says just 17.
I know the size of the rims are 15x6 but what do these other numbers mean? and what difference do they make if they aren't the same?
thanks for any help

 

the turbo rims are 16x7 with 40mm offset I believe, if that helps any.

 

The JJ numbers are standardised number referenceing to size.

The 16 or 17 is more than likely the number in the cast or the mold number.