- - how wide can I go
||03-15-2008 07:34 PM
how wide can I go
ok I have a 2001 325i sedan and was looking at getting a set of wheels I know a guy with a set of 18's with the 5x120 bolt pattern so they will bolt
the front are 18x8 with a 38 offset and 235/40/18's I'm not to worried about these the the rear has me worried
they are 18x9 with a 40 offset and running 265/35/18's and I think these are just too big but if they fit I would like to get them thanks for the help guys
Originally Posted by Rooz
Had a little time on my hand today...
Let's figure out the diameter of the factory setup...
Considering that 1 inch = 25.4 mm
Front: 225/25.4 = 8.8.....
8.8.... * .45 (45% of width is tire profile) = 3.9....
3.9... * 2 (top + bottom) + 17 (wheel size) = 24.97...
So the factory front setup is 24.97 inches tall
I'll spare you the explanations for the rear..
Rear 245/40/17 = 24.71 inches tall
Now, again.. I don't know too, too much if I'm correct but my guess is I need to come as close to those numbers as possible, right?
SO..... from what I calculated here's the closest setup I could think of on an 18" wheel....
Front: 235/40/18 = 25.4 inches tall
Rear: 255/35/18 = 25.02 inches tall
BUT... A 225/40/18 = 25.08 inches tall...HOWEVER being that the wheel is 8.5" wide (inside proportions so I am ASSUMING outside proportion is probably close to 9")
9" = 228.6 mm Meaning a 225mm tire would be too narrow for this wheel? AM I correct? And IF the wheel's INNER width is 8.5" then the 235/40/18 would be the proper setup, but if 8.5" is the outside width then 8.5" = 215.9mm, then the 225/40/18 would be perfect?
I posted that a long time ago, hope it helps
||03-15-2008 08:48 PM
thanks for the info but when it come to the conversions I'm ok I'm just more worried about rubbing with the width of the rear wheel
255's you'r safe
265's you may rub
||03-15-2008 09:36 PM
I wonder if anyone on here is running then I just could get these on the cheap but if I have to get tires it not such a deal
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