Greg..your formula only works if the change in "J" is 1 inch (25.4mm) larger...the change in offset should be 1/2 the change in wheel size (J)...

 

I don't drink but this thread is going to get me started drinking!!!

 

well here's to your health! I'm getting out of this thread while I still can...

 

But are you "positive"?$#%^@&*((

 

Have a beer with me! Im here Bud Light in hand!

 

"Can" I do that?

 

last time I checked.......12.7 was about half of 25.4
Larger...smaller...the effect of 1" (1J) is 12.7.....one way or the other (unless I am missing your point).
1/2 J is 6.35
1.5J is 19
should I go on

 

you did miss my point...read your original post...you said "for every increase in J width (on a different wheel) add 12.7mm in offset in order to maintain the same 'fender line' on the larger wheel" you did not say for every inch in J increase...you obviously understand how it works by your last post, it was just that your original post was misleading...no offense intended

 

Please, NO.