Why the number 15 on my alloys?

andysat

Lifer
Hi all -looking at my 16's and 17's i have noticed a number 15 stamped on the face of both sizes-why is this??-sorry if this is blindingly obvious! :oops:
 
Given that 108s have et50 on the rear, not sure this number is offset.

Could be wrong though....


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Some 108's have 15 others 8. I'd assumed it was a casting reference, but probably way off.

Good question
 
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