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      02-09-2017, 11:17 AM   #1
KMORGSM5
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Widest possible rear 20'' Rears

Been thinking about getting a new set of wheels and was wondering if anyone knew what the widest possible wheel we do go with for the rears on stock CP suspension? 20x12?

trying to get widest possible rear tires to help with traction
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      02-09-2017, 12:03 PM   #2
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11 would probably be your best bet, to prevent any tire rubbing. As you can see from the picture below, running a 11" +25, its pretty aggressive. Let me know if i can be of any assistance in helping you get a set.

21x9.5 +23 / 21x11 +25

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      02-09-2017, 12:07 PM   #3
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      02-10-2017, 11:40 AM   #4
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Quote:
Originally Posted by KMORGSM5 View Post
Been thinking about getting a new set of wheels and was wondering if anyone knew what the widest possible wheel we do go with for the rears on stock CP suspension? 20x12?

trying to get widest possible rear tires to help with traction
11 is the widest , good luck ??
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      02-10-2017, 04:48 PM   #5
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12 is the widest , I'm running 21x12 rears no problem with 325's Pzero's
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      02-10-2017, 04:56 PM   #6
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Quote:
Originally Posted by MpowerMike View Post
12 is the widest , I'm running 21x12 rears no problem with 325's Pzero's
Pictures? What offset?
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      02-10-2017, 07:00 PM   #7
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I believe m6beast is running 12" & 325 with no issues.
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      02-10-2017, 07:14 PM   #8
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12" with 325's would be a perfect choice but would need a perfect ET, tyre make and type will need careful selection and possibly rolled fenders on an M5.

Inerrested to see if anyone has this info...
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      02-11-2017, 02:28 PM   #9
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20x12 would be perfect for me, been looking at forgeline wheels
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      02-13-2017, 04:01 PM   #10
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Quote:
Originally Posted by vividracing View Post
Pictures? What offset?
Yes pictures and info please
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      02-13-2017, 08:00 PM   #11
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Same here would like to see pics. Has anyone tried 325 on a 21x11 since 315 is apparently not available or is 305 the max? The 305 PSS on my 21x11 have much more stretch than the 295 Pzero on my 20x10 601s
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      02-15-2017, 10:08 AM   #12
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Running a 21x12

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      02-15-2017, 11:38 AM   #13
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Wow, look great, any more pictures
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      02-15-2017, 05:03 PM   #14
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Quote:
Originally Posted by Igor_M5 View Post
Running a 21x12

What tire size? They look pretty stretched
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      02-16-2017, 01:47 AM   #15
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I ran multiple tire sizes, the one thats in the photo is a 295/30/R21 PSS X (not XL) . Never ran 25 profile tires, which obviously would yield much wider tire, but my city got 3rd world problems.







I've experimented with many dif sizes on those wheels, due to my offset however, I cannot go wider than 305 unless I do 25 profile, or shave the back bolt face on the wheels (its made thicker intentionally so I have that option).

Had 305/30 P-Zero GT's, 285/35 Pilot Sports, few others I forgot. Favorite has been the same I have now, but XL tires, they're meatier, provide just the right stretch so I can see the little bit of the lip from straight back, and a nice chunky wall.

Last edited by Igor_M5; 02-16-2017 at 01:55 AM..
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      02-16-2017, 04:46 AM   #16
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Looks great, love it. What are your wheels ?

Hmm I wonder If I could fit 12x20. are you 10's up front ?
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      02-16-2017, 05:03 AM   #17
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PS what wheels are they ?
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      02-16-2017, 11:41 AM   #18
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Hmmm, thought they might be ADV, but doesn't look like it. The more I look at them the more I like, similar in a good way to the stock M5's
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      02-19-2017, 04:48 AM   #19
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What make are these wheels, still can't find them !
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      02-19-2017, 09:52 AM   #20
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Take the tow hook off the back... this ain't no civic
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      02-19-2017, 12:49 PM   #21
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Depends on the ET. Your OEM 343M (M5) has 34 mm offset on rear coming with 295 tire so if you want to use 315 tire you need offset about 24-25 then you can go for 11" rims however you might have some rubbing issue on fender side.
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      02-22-2017, 11:02 AM   #22
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Quote:
Originally Posted by LA-M55 View Post
Take the tow hook off the back... this ain't no civic
BRB, gunna go take it off just for you.

You do realize that they are functional, and that people may actually use them for valid reasons. This wasn't a photoshoot, or a planned photo, just caught a moment.

Anyway, smh.


Quote:
Originally Posted by carrera2RSL View Post
Looks great, love it. What are your wheels ?

Hmm I wonder If I could fit 12x20. are you 10's up front ?
You can go as wide as 12.5" in the rear, but anything 12" or wider will require precise offsets and understanding what tire sizes you will be limited to. I was going to do a 12.5", but given that it was my first time doing the measurements, and the rest of the process being over the phone... I didn't want to risk it, especially since I was shipping my car to CA, and getting the wheels installed the night before Bimmerfest lol

Fronts are... lame. The wheels were literally assembled 24hrs before a show, and inner barrels I needed wouldn't be available till after the weekend, so I got stuck with what was available on the spot - resulted in a disappointing 9.5". The faces & outer barrels are already spec'd out to accomondate a wider inner barrel that would result in 10.5", which was originally planned.

I just removed the wheels off the car since its going back on lease so I'll end up ordering wider inner barrels and rebuilding them once I figure out what BMW they'll be going on next. If I was to build another set, I could say that I would comfortably go with 12.5" rear & 11" front.

Wheels are by Kompression Wheels (godfather of the 3pc forged wheel industry in the US). I designed the concept, they did the engineering corrections (maximing safety & reliablity while maintaining aggressive structural design). This is the only set of wheel like this, would love to go through the process again to make some minor adjustments and clean up the design a little bit more so it's even more OEM, but 3pc.

The spoke design is based on the M4 style 437's
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