ZPOST - View Single Post - Questions on the Right Square Setup (Apex Arc-8's)

3002 tii · 03-19-2012, 09:42 AM

Ok, so I'm considering picking up a set of Apex Arc-8's for the upcoming track season but I'm having a hard time deciding the best package. The weight differences are negligible in the 1-2# I save from going to 18->17 since I pick up the same difference by going to a higher profile tire. So I think the decision comes down to running a 40 profile vs 35 and having to run a spacer vs not....

I know a higher profile can adversely affect turn-in, and spacers in general are not something I'm crazy about but I know plenty of people run them without issue. Maybe I'm wrong but I view the non-M Z4's comparable to the e36's and I think 17's are pretty common for them so I'm thinking it should not be a issue but again, I might be wrong on that one. Can anyone provide input?

17x9, et 30 - no spacers, 255/40 square
vs
18x8.5, et 40 - 5mm spacer on front, 255/35 square
vs
18x9, et 42 - 12mm spacer on front, 255/35 square

Also on a similar note, when looking at the benefits of running a square setup, aside from same width wheels & tires, does it also assume/require the same offsets? For example, if I ran a 18x8.5 square setup, but the fronts were say 40 offset and the rears were 35, would the wider track in the rear make a difference?

03-19-2012, 09:42 AM	#1
3002 tii Lieutenant General 2286 Rep 12,565 Posts Drives: Z4 M, X5, GX460 Join Date: Apr 2008 Location: CT iTrader: (99) Garage List F15 X5 xDrive35i [8.75] E86 Z4 M [10.00] F10 550i (Retired) [9.17] F25 X3 xDrive35i (R ... [9.43] E82 135is (Retired) [9.50] E85 Z4 M (Retired) [9.41] E90 328i xDrive (Re ... [9.25] E86 Z4 3.0si (Retired) [9.24]	Questions on the Right Square Setup (Apex Arc-8's) Ok, so I'm considering picking up a set of Apex Arc-8's for the upcoming track season but I'm having a hard time deciding the best package. The weight differences are negligible in the 1-2# I save from going to 18->17 since I pick up the same difference by going to a higher profile tire. So I think the decision comes down to running a 40 profile vs 35 and having to run a spacer vs not.... I know a higher profile can adversely affect turn-in, and spacers in general are not something I'm crazy about but I know plenty of people run them without issue. Maybe I'm wrong but I view the non-M Z4's comparable to the e36's and I think 17's are pretty common for them so I'm thinking it should not be a issue but again, I might be wrong on that one. Can anyone provide input? 17x9, et 30 - no spacers, 255/40 square vs 18x8.5, et 40 - 5mm spacer on front, 255/35 square vs 18x9, et 42 - 12mm spacer on front, 255/35 square Also on a similar note, when looking at the benefits of running a square setup, aside from same width wheels & tires, does it also assume/require the same offsets? For example, if I ran a 18x8.5 square setup, but the fronts were say 40 offset and the rears were 35, would the wider track in the rear make a difference? __________________ Follow for latest mods Last edited by 3002 tii; 03-19-2012 at 10:57 AM..
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