Originally Posted by Rico750
18inch oem's offset is +45.
The wheel bolt length you should buy, all depend on offset is what I've learned from here. I believe that the oem length of the wheel bolt is 28mm (14x1.5x28). SO, if you decide to do +38 offset... that is a 7mm difference, so you would then add 7mm to the 28mm wheel bolt. Which means you'd look for 14x1.5x(28+7)...32. They might not have exactly 32 (ecstuning.com has 33 > http://www.ecstuning.com/Audi-B6_S4-...s/Wheel_Bolts/
) I hope this makes sense!
Oh and if you get a spacer, say 5mm like you posted... also add 5mm. I think this is right? Correct me if I'm wrong anyone, I am here to learn as well