Hey guys im wondering if an 18x8 with a 20mm offset (ours is 16mm right?) on a 5x120mm bolt patern (5x4.75) would fit on a stock iroc? sounds like it so far doesnt it? these are basically stock offset and bolt pattern, and they are 18's in anthracite (black) that i can get new for about 100 each.

honestly I dont know if they would fit. you'd have to do the coversions. sounds like BMW wheels or something (being in mm and all). when I ordered my 18's (they shipped yesterday) I had them custom made to fit my Camaro. the only advice I can really give is that you'd definately need to run 40 series tires to avoid rubbing. on 8" wide wheels we have +0mm offset in the front (4.5" backspacing) and +16mm on the rear. Can you get those wheels in different offsets? I also believe the bolt pattern is 5x120.6mm but people have gotten away with 5x120. Not sure though. Ask redrocket

I thought a 0mm offset on a 8 inch wide wheel would net you a 4 inch offset? while the 16mm would be 4.5?

also 4.75" is 116.75 mm not 120 mm. the 18x8 with 20mm offset is about 4.75 in backspacing. shouldn't be too bad. with it being 18" it'll clear the tie rods up front.

Hmm. I though 5 X 4.75" was equivalent to 5 X 120.7mm or 5 X 120.65 or something like that.

unless my calculator is off 4.75" * 24.5 = 116.75 24.5mm - 1"

mrr23, you're doing it the right way, just not with the right number. There are 2.54 cm in an inch so that would be 25.4 mm which is somewhere around 120.65 I believe.

yep dang it. my numbers are off. hate it when i do that. so it's 120.65