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      01-24-2013, 04:10 AM   #12
AWBimmer
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Drives: E92 335D Pre-LCI
Join Date: May 2011
Location: UK

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Thanks guys, I think one crucial piece of info I forgot to include was that I'm dropped on BC BR series coilovers but since I'm getting a full audio boot install, I'll be getting new longer springs to accommodate for a good stance, not a dumped / dub style!

I understand this changes what spacers you guys have suggested. I'm going to raise the car and get 215/35 fronts and hopefully 255/30 rear, on what I believe (with the measurements I've taken, since reading the stamped info on the back so awkward!!) are 8.5j front and 10j rear – read on

I think I've had to recalculate!!
The way I've worked that out is measuring the overall width of the wheel and subtracting 1" or 25mm off the measurement since the measurement is take from the outside lip of wheel to inner lip of hub mounting side. This will therefore equate to..

Fronts
240mm overall width
(Less 25mm)
= 215mm ..... = 8.5J if converted
.. Centre Line is 120mm (240 divided by 2)
.. Backspace is 160mm

Therefore the diff between Backspace and Centreline is 40mm so at offset of ET40 front!

Rear

280mm overall width
(Less 25mm)
= 255mm ..... = 10.2inches (J) if converted
.. Centre Line is 127.5mm (255 divided by 2)
.. Backspace is 165mm

Therefore the diff between Backspace and Centreline is 37.5mm, so an offset of ET38 rear!

I simply can't go wrong with a measuring tape I figured and would rather do the calculations myself than to go by Illegible stamped info.

How does this sound now??
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Last edited by AWBimmer; 01-25-2013 at 10:44 AM.