11-23-2016, 10:35 AM | #1 |
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Max sidewall on 20" wheels?
I'm about due for a new set of tires and I'd like a bigger sidewall. I think the look of the OEM tire spec is a bit too small for the wheel well. Has anyone tried a 45/40 F/R setup?
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'08 Z4 ///M Coupé (#1765/1815) — 1 of 68 Sepang Bronze / Black Nappa / Madeira Wood / 1 of 1 this combo
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11-25-2016, 09:26 PM | #2 |
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I just started another thread and asked the same question. I agree., the wheel well is huge. I'll talk to my wheel guy tomorrow and see what he says.
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11-26-2016, 02:33 AM | #4 |
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I don't care about speedometer accuracy. There's approx 0.5-1.0 inch gap between the top of the tire and the front suspension currently. I want to know if a 45 will fit. We're not talking crazy out of spec diameter here.
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'08 Z4 ///M Coupé (#1765/1815) — 1 of 68 Sepang Bronze / Black Nappa / Madeira Wood / 1 of 1 this combo
19" Advan RS / AP Racing / Bridgestone RE-11 / Autosolutions SSK / R.E. Diablo / R.E. trans mounts '09 X5 35d — Space Grey / Saddle Brown 20" Forgestar F14 / SCR Delete |
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11-29-2016, 12:40 PM | #6 | |
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Do I think a larger sidewall from 40 to 45 upfront or 35 to 40 in the rear will fit. My gut tells me yes, but, I'm not 100% and frankly, the clearance will be VERY close where the sidewall rounds to meet the flat contact patch. Stick your fingers back there and you'll see what I mean. Hope that's helpful. |
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11-29-2016, 02:26 PM | #7 |
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Yeah I was ready to take a gamble and started searching for tires but I didn't find any 45/40 combo available for the staggared 20". So my desire is moot unless someone else wants to spend more time researching.
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'08 Z4 ///M Coupé (#1765/1815) — 1 of 68 Sepang Bronze / Black Nappa / Madeira Wood / 1 of 1 this combo
19" Advan RS / AP Racing / Bridgestone RE-11 / Autosolutions SSK / R.E. Diablo / R.E. trans mounts '09 X5 35d — Space Grey / Saddle Brown 20" Forgestar F14 / SCR Delete |
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12-01-2016, 11:56 PM | #8 |
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You need to be concerned about the overall diameter and ensuring that the front and rear are exactly the same diameter...maximum overall diameter is 30.5" and the rim/tire must clear the upper suspension piece in the front.
http://www.bimmerfest.com/forums/arc.../t-802986.html Closest I've found is stretching it in 265/45R20 and 295/40R20 but still has a tenth of an inch difference which is enough to mess with the xdrive. Unless you're running a square setup you will have issues finding the right fitment.
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12-02-2016, 01:03 PM | #9 |
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Why don't you use spacer?
For your 09 X5 35d ? ESC Tuning: 12.5 mm front / 20 mm rear Front: https://www.ecstuning.com/b-ecs-part...t/ecs263e70wb/ Rear: https://www.ecstuning.com/b-ecs-part...t/ecs265e70wb/ You will see your 20" rims and tires larger and will look more agressif
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12-02-2016, 02:34 PM | #10 | |
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