Quote:
Originally Posted by nytrydr
Are the front and rear OEM lug nut length both 27mm? Trying to determine that length of lug nut required if i did a +15mm front spacer and +20mm rear.
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Yes, stock BMW bolts and rims are all designed for M14x1.25 27mm shank bolt. In fact, my dealer parts department simply doesn't carry any other size in the M14x1.25 spec.
Adding bolt-through spacers in that case just adds that thickness to required bolt length. It doesn't have to be quite exact, a couple of mm either way will normally be close enough, but I would start to pay careful attention around and above say +/- 2mm for sure.
Note also that thicker spacers are not necessarily bolt-through and rather do a two stage mount: spacer to hub, then rim to spacer. 20mm is probably at the edge of where that becomes a necessity. My rear winter non-stock rim spacer at 22.5mm is like that. This requires further bolt attention. Normally a spacer supplier will give you the right spacer to hub bolts, but they need to know your exact car model to do that. Rim to spacer bolts will be stock 27mm for stock rims, and something else for non-stock rims.