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Jeep JK question

Backspacing

Backspacing on the factory JK wheels is 6.25"

16" wheels work fine. There are issues with most 15" wheels though.
 
All of the brakes are the same. All of the tires/wheel combos are interchangeable (sahara/rubicon/x)

There are a lot of people running 15's, but I'd check clearance with the exact wheel before buying anything....I'd go minimum 16's
 

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