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03-07-2011, 11:55 AM | #111 | |
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03-07-2011, 03:17 PM | #112 | |
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I used to have 9.5" rears with +22 and those fit easily, even with slightly lowered suspension. However, I never checked the inside clearance, so you're gonna hafta do some homework on this one, sorry bud |
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03-07-2011, 04:08 PM | #113 |
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^boo thanks though. thinking the addition of 10mm/12mm spacers would be perfectly fine, but don't want to run spacers in the first instance. i need to stop myself from being tempted to get wheels!
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03-07-2011, 06:16 PM | #114 | |||
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My front RAC RG63s are pretty aggressive and I do have some room to spare on the inside. Also, the fronts have more material in the flange than the rears, so at least in my theoretical head, it might be possible. I haven't contacted RAC to find out if a few millimeters could be shaved off and maintain structural integrity though. I just may do that now that we've brought this topic up though! Quote:
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03-07-2011, 07:04 PM | #115 |
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^using ur rear wheel measurements, 10" et27, calculators show 10mm less clearance between the inside of the wheel and the strut housing compared with stock. for 9.5" et35, i'll contend with 11mm less clearance, which according to ur eyeball estimation, should still clear on the inside with barely 7-8mm to spare. on the outside, 9.5" et35 will extend outwards by 1mm over stock, so next to negligible. granted, running 10mm spacers on the rears would give the perfect, flush look, and give more clearance on the inside of the wheel. thanks for ur input!
still, really pinching myself hard not to bite the mod carrot again.... |
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03-07-2011, 07:41 PM | #116 |
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Agreed on the numbers. I guess that's the issue - going from stock to something else, you'd kind of like to bring the whole wheel outward a bit, rather than just add width on the inside. Maybe a 9.5" et, say, 25-30 would be more ideal. 9.5 et 35 would fit, just could be better. Maybe this alone is a reason to hold out for something more optimal....I can't condone giving up on the idea though!
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03-07-2011, 11:51 PM | #117 |
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^it's really a self-fulfilling prophecy. i'll keep thinking about it to no end, and eventually i will hypnotically open my wallet, drop a wad of dough, and next u thing u know, bam! new wheels.
curse this addiction! |
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03-08-2011, 07:16 AM | #119 |
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rG4s - why you don't use 10 -ET 35 in place of 9.5?
it doesn't work ? I bought that for my Z4 (R 255/35/18 10J ET35 F 225/40/18 ET 8.5J ET 35) .. I'm waiting for the delivery - 4 weeks. :- ( still 2 to wait. |
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03-08-2011, 08:36 AM | #120 |
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^isn't 10" et35 going to be even less clearance on the inside? i'm not familiar with the 3.0si offsets, but on the m's et35 in the rears with 9.5" is very close. also, i'm considering a local set which is why i don't have much choice!
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03-08-2011, 10:44 PM | #121 |
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alright, thanks to nikki, verified tt 9.5" et35 will clear the inside of the rear wheel wells. question i'm having now is, front diameter is going to be 25.4", and rear is going to be 26.35". how significant is this 0.95" difference in tire diameters going to affect stance, handling, speedo error etc, if any?
am looking at a local set of m6 reps - 18x8.5 et35 fronts with 235/40 ps2's, 18x9.5 et35 rears with 265/40 ps2's. $1200 picked up sounds reasonable? 1 year old, 6000 miles, minor curb rash on one of them, no bends, cracks, peeling etc. |
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03-08-2011, 11:11 PM | #122 |
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According to this calculator for percentage difference between stock and aftermarket sizes in terms of combined wheel/tire overall diameter:
http://www.e90post.com/forums/forumdisplay.php?f=12 Your rear wheel/tire setup will be 1.195% off from stock. Which means your speedo will read 61 mph when it's actually 60mph. Negligible difference BTW, the comparison isn't between your front and rear wheel/tire overall diameter. It's comparison between each corner's individual totals. i.e., what I did above to get you that result was compare stock rear wheel spec: 18x9 +35 w/ 255/40/18's vs. the aftermarket set you're looking to get: 18x9.5 +35 w/ 265/40/18's. Last edited by mfanatic325; 03-08-2011 at 11:16 PM.. |
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03-09-2011, 12:05 AM | #123 |
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^thanks mfan, but my concern is the rear diameters are larger than the fronts, meaning won't the car 'lean' forwards ever so slightly, thus maybe having more wear on the front tires (since balance is slightly forward), and this will in-turn maybe marginally affect handling/braking? maybe i'm over-thinking things.
what do u think of the price? the ps2's have a 2005 date of manufacture though.... |
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03-09-2011, 12:15 AM | #124 | |
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Also, I don't recommend those 2005 production tires. Rubber degrades over time, and it's just better peace of mind to get something else. Plus, I've always felt that PS2's were overpriced and overrated. Get Dunlop Star Specs. You won't regret it |
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03-09-2011, 11:52 AM | #125 |
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r4gs - normally in Z4's the front tire is 40 and behind is 35 so if you take 265/35/18 behind and 235/40/18 in the front .. you will have no speedo error.
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03-09-2011, 07:23 PM | #126 | |
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I think nearly 1" diameter difference in tire size front to back will be noticable visually and might look a little weird. Stock 255/40/18 tires all run right at 26" diameter, give or take maybe 0.1". Even though the fronts clearly will not affect the speedo, you can't make too drastic of changes up there because it could potentially affect DSC. In general, I think a half inch or less difference in diameter, front to back, would be desirable from an appearance point of view. Beyond that, it's just a matter of comparing any desired tire sizes to what stock is just to keep diameter close for the sake of not screwing with the speedo too much or potentially triggering DSC issues.
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03-16-2011, 11:34 AM | #127 |
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im running 19x8.5 et 32 with 235/35/19 19x9.5 et 27 with 265/30/19 no rub at all, setup looks great would like to be ideally @ et 25 on the rear.... the front 8.5" looks awesome with et 32, nice and flush.
receieved great advice on here :-)
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03-17-2011, 12:24 AM | #128 |
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I just wished the moupe had more clearance up front... I would love to run an 18x9.5 et22 squared setup...
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03-18-2011, 12:29 PM | #129 |
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03-25-2011, 07:42 PM | #130 |
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For a stock Z4MR would:
F 18 x 8.5 ET35 R 18 x 9.5 ET25 Tires: F 235/40/18 R 265/35/18 work and look good? Last edited by Samjam927; 03-26-2011 at 10:39 PM.. |
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03-27-2011, 09:51 AM | #131 |
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BMW Z4 BBS wheels
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03-27-2011, 06:46 PM | #132 |
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BUMP! any help would be greatly appreciated
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