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03-10-2022, 08:07 AM | #1 |
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Arc8 in 18x10ET25 and 18x9ET42 tyre sizings?
Planning on fitting the above rims to a coupe with standard suspension.
Tyre sizing 234 45 18 for the front, given a big caliper may be on the cards later and the ET of 42, will spacer with bolts either 15 or 17mm, while at the rear ET25 will run 265 40 18's (No spacer) Any comment and or advice from the readers here? having run these wheels on our 3.0si coupe with 225 40 18 tyres and 255 35 18's and no rub this combo should work OK on the Z4M. On the 3 litre coupe the tyres were probably on maximum sized rims, (stretch I think is the term here) hence the size upgrade on the vehicle switch Thanks for reading. |
03-10-2022, 08:11 AM | #2 |
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Footnote to the above. Jeepers guys sorry about the size of pix.
This week we have added to the car pictured Konisportpaket adjustable shocks. H&R ARB's and a set of drilled and slotted discs. |
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03-18-2022, 09:21 AM | #4 |
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I run the following setup, similar to what Apex recommends. Great support by the way, definitely suggest you send them an email as well.
https://support.apexraceparts.com/hc...-Fitment-Guide Front - 18X9 E30 245/35/R18 w/ 5mm spacer (2-3 deg of negative camber) Rear - 18x10 E25 275/35/R18 Slight rubbing on the front under full compression hard cornering (track), no street issues |
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03-19-2022, 12:41 AM | #5 |
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03-19-2022, 08:34 AM | #6 |
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My M coupe currently has 245/35-19 ET31 on the front and 275/35-19 ET25 on the rear with no rubbing, lowered with H&R coilovers.
So I would think that setup your planning would be fine. Here are two calculators that will allow you to play around with different configurations to see what works. https://www.blocklayer.com/tire-size-calculator.aspx https://www.1010tires.com/Tools/Whee...et-Calculator#
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03-24-2022, 07:20 AM | #7 | |
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Quote:
I just removed all the wheels yesterday and there is some rubbing on the plastic wheel well liner on the rear, sorry about that. I removed the rear spring and added a 5mm urethane shim, it seems to be fine now.
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2008 E86 M coupe
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03-27-2022, 09:26 AM | #8 |
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Garage List E86 Z4 M [10.00]
F15 X5 xDrive35i [9.17] F10 550i (Retired) [9.17] F25 X3 xDrive35i (R ... [9.43] E82 135is (Retired) [9.53] E85 Z4 M (Retired) [9.41] E90 328i xDrive (Re ... [9.25] E86 Z4 3.0si (Retired) [8.93] |
Those fitments are taller than factory specs, that plus wider wheels you run more risk or rubbing. I would drop down 1 profile in height
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