If I run 35/12.5 tires how much back spacing do I need on my wheels?

 

4.5" is a fairly standard/safe answer. Some are running 5" or a bit more with no issue, just depends on the specifics.

 

What size wheels are you planning on running?

If you are planning on running 15's then you need to think about future upgrades, such as an aftermarket tie rod. With 15's interference issues come into play.

 

Synergy tie rod works with 15's, there's a thread out there.

Sent from my DROID4

 

Just FYI, I picked up a set of 15" Black Rock Vipers from someone who had rubbing from a Synergy tie rod.

 

Yes I have the Synergy tie rod on my JK. It all comes down to having the correct backspacing with 15's. The RK tie rod will work as well but again you need the correct back spacing.

 

I will be running 16" wheels if I don't decide to go bigger.

 

With that in mind you will be fine with 4.5" of back spacing. That will keep you pretty close to the edge of the fender. If you don't care about having tire coverage then you can go with something like 4" or 3.75" of back spacing.

Let us know if you would like a quote on a set of wheels and we can set you up.