Backspacing

Anyone know how to calculate backspacing? I’m a noobie on that stuff and I’m trying to find out when I upgrade to bigger tires will I rub my UCA’s. I’m running 17x8.5 0mm Offset

 

Here:

https://www.wildhorses4x4.com/product/Wheel_Backspace/tech_faq


https://www.lesschwab.com/article/what-is-wheel-offset.html

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Super simple: wheel width divided by 2 plus 1/2” . Then just add or subtract the amount of offset. Ie your wheel: 8.5/2 = 4.25 + 1/2” = 4.75 bs.

 

So what would a 17x8.5 rim be?

 

That’s the example I gave you. It was for the wheel you said your running. 17x8.5 0 offset.

 

Damn lmfao. That went right over my head. Thanks bro hahahaha

 

No worries. Glad I could help

 

The thing that get’s muddled is that backspacing is measured to the widest part of the wheel and advertised wheel width is measured bead to bead. Even on tire store descriptions, it’s, OK, OK, OK, wait, WHAT? So, the overall width of a 8.5” wheel is 9.5” wide. That’s why gotoman posted to add 1/2”. That takes into account the difference between advertised wheel width and overall width.