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JJ notation in wheel sizes


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I have been looking at some wheels and noticed a lot of wheel maker use a notation in there sizing charts of JJ. For instance Volk lists, for 15" wheels, 5 1/2JJ, 6.0JJ, 6 1/2JJ,ect. ect up to 8.0JJ. Does anybody know what the JJ means? I noticed different bolt patterns and offsets were available depending on the JJ notation. Also price seemed to go up as JJ went up. Can anybody help?

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I have been looking at some wheels and noticed a lot of wheel maker use a notation in there sizing charts of JJ. For instance Volk lists, for 15" wheels, 5 1/2JJ, 6.0JJ, 6 1/2JJ,ect. ect up to 8.0JJ. Does anybody know what the JJ means? I noticed different bolt patterns and offsets were available depending on the JJ notation. Also price seemed to go up as JJ went up. Can anybody help?

 

The numbers are the rim width in inches; that's the extent of my expertise. To learn about JJ (along with gobs of other minutae) go here:

 

http://www.carbibles.com/tyre_bible.html

 

JJ related is about half way down the page.

 

 

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