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      11-30-2014, 04:34 PM   #1
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Front M vs Non-M

The front suspension of the M and non-M are essentially the same aren't they? Based on the e46? So any wheel fitment used on an M would work for a non-M, right? I'm trying to decide proper wheel offsets and don't want rubbing for 18s. Car will be on Coilovers. So, I'm thinking the 235/40-18 8.5 et 35. Seems like the safest yet still aggressive option.
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      11-30-2014, 05:45 PM   #2
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Quote:
Originally Posted by SDCoupe View Post
The front suspension of the M and non-M are essentially the same aren't they? Based on the e46? So any wheel fitment used on an M would work for a non-M, right? I'm trying to decide proper wheel offsets and don't want rubbing for 18s. Car will be on Coilovers. So, I'm thinking the 235/40-18 8.5 et 35. Seems like the safest yet still aggressive option.
seems possible, though i personally have no experience with a non-m. what kind of wheels are you getting?
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      11-30-2014, 06:00 PM   #3
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I'm thinking the new Apex PS-7s. Light weight and classic.
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      12-01-2014, 12:39 AM   #4
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Quote:
Originally Posted by SDCoupe View Post
The front suspension of the M and non-M are essentially the same aren't they? Based on the e46? So any wheel fitment used on an M would work for a non-M, right? I'm trying to decide proper wheel offsets and don't want rubbing for 18s. Car will be on Coilovers. So, I'm thinking the 235/40-18 8.5 et 35. Seems like the safest yet still aggressive option.
I rubbed with a 235/40 on a 8.0 et34 on stock suspension because the tire was too tall. You're better off running a 255/35 on 8.5 with high 30 to low 40 offset. Worst case you might need to pull the strut pins and dial in some negative camber.
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      12-01-2014, 08:21 PM   #5
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Quote:
Originally Posted by 3002 tii View Post
I rubbed with a 235/40 on a 8.0 et34 on stock suspension because the tire was too tall. You're better off running a 255/35 on 8.5 with high 30 to low 40 offset. Worst case you might need to pull the strut pins and dial in some negative camber.
Damn, do you know what you were rubbing on? Fender liner around where the bumper and fender meet each other?

Interesting to see the Z4 and Z4M have differed OE tire profiles. Non-M is 225/40 & 255/35 while M is 225/45 & 255/40.
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      12-01-2014, 09:09 PM   #6
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Originally Posted by tiltmode43 View Post
Damn, do you know what you were rubbing on? Fender liner around where the bumper and fender meet each other?

Interesting to see the Z4 and Z4M have differed OE tire profiles. Non-M is 225/40 & 255/35 while M is 225/45 & 255/40.
That's exactly where it was rubbing, where fender and bumper meet.
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      12-01-2014, 10:02 PM   #7
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Quote:
Originally Posted by 3002 tii View Post
That's exactly where it was rubbing, where fender and bumper meet.
@sdcoupe - How low do you plan on dropping the car? ^^^ This is where I had some rubbing issues as well but your desired ride height is going to have an effect on things as well.
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      12-01-2014, 10:05 PM   #8
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Quote:
Originally Posted by 3002 tii View Post
I rubbed with a 235/40 on a 8.0 et34 on stock suspension because the tire was too tall. You're better off running a 255/35 on 8.5 with high 30 to low 40 offset. Worst case you might need to pull the strut pins and dial in some negative camber.
I'm running 255/35 x 18 on 8" ET 47 Style 108's in the front. No rubbing or issues. From clearance measurements I've made I could probably run 265/35 if the brands I run made that size. The strut pins are pulled and front camber is maxed out at -1.4 degrees.

3.0si Roadster with M Sport suspension.
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      12-05-2014, 08:56 AM   #9
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The front suspension is very different between the m and non m...the m uses e36 bottom mounts, the non m uses e46 mounts...for clearance purposes they won't be drastically different though
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      12-05-2014, 11:32 AM   #10
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Quote:
Originally Posted by tiltmode43
Quote:
Originally Posted by 3002 tii View Post
That's exactly where it was rubbing, where fender and bumper meet.
@sdcoupe - How low do you plan on dropping the car? ^^^ This is where I had some rubbing issues as well but your desired ride height is going to have an effect on things as well.
Probably not too low. I'm just looking to remove some fender gap. I don't want to have to pull pins and change camber. Just drop it a tad to make clean look.
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      01-06-2015, 01:07 AM   #11
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I just had mounted 235/40-18 front on new Apex PS-7 8.5' rims with Michelin Pilot Super Sports with 35 offset. No rubbing! Rears are 265/35-18 on a 9.5' rim with 43 offset. Again, no rubbing! Very stoked. It looks great. Need to put the coilover suspension on now and remove the fender gap.
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