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      12-02-2010, 04:13 PM   #1
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How to make 20*9 +9 & 20*10 +14 wheels fit without modifications to the car...

Hey guys, I bought a set of HRE wheels with the following specs:
Front 20 * 9 ET +9
Rear 20 * 10 ET +14

Obviously, the offset is very low for the e92m. However, I recently saw a pair of BBS in similar offsets work, but the m had aftermarket suspension so I am sure they were able to tweak the settings to make it work. I do not want to make any modifications to my car, but I am willing to make modifications to the wheels themselves to make them fit.

I was told the rears should work no problem, but I want to verify here... I do not want any rubbing issues on my car. I am only slightly lowered due to it being a ZCP.

I have gotten conflicting responses regarding the fronts. HRE confirmed that they will NOT work and that they need to be rebarreled. AKA I need to replace the inner and outer barrels (2.5 outers and 6.5 inners) to raise to offset to about 21. I can also just replace the outers to 2.5 to make the offset about 15 with a width of 8.5".

Of course the best option for me is not to spend over 1k getting them rebarrelled. It was mentioned that I can get away with just going with 245/30/20 and 275/30/20 tires and have 0 rubbing issues? I am skeptical though...

What would you guys recommend?
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      12-02-2010, 04:53 PM   #2
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Fronts are basically on the upper edge of reason...you may need to max out the camber.

9 ET9 = 9.5 ET15 = 10.0 ET21...which has worked for some. 9.5 ET 22 is common, so is 10.0 ET25...

Super super aggressive and you will have about a cm out of the wheel well. With a 235 should work - maybe a 245.
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      12-02-2010, 08:23 PM   #3
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Quote:
Originally Posted by GewoW View Post
Fronts are basically on the upper edge of reason...you may need to max out the camber.

9 ET9 = 9.5 ET15 = 10.0 ET21...which has worked for some. 9.5 ET 22 is common, so is 10.0 ET25...

Super super aggressive and you will have about a cm out of the wheel well. With a 235 should work - maybe a 245.
First off, thanks for the reply.

I don't want to make any camber adjustments or any suspension modifications, so basically I should definitely get the fronts rebarreled, correct? Do you recommend me doing the inner and outer barrels for an offset of ~21 or could I get away with just replacing the outers and run a ~15 offset? The rim would only be 8.5" wide (2.5 outers, 6 inners).

Rears are fine, yea?

Which tires sizes would you recommend for the rears and the fronts (if rebarreled to your recommendation)?

Thanks!
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      12-02-2010, 08:26 PM   #4
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255/Front
285/Rear

You will rub at full lock on the passenger front fender liner with that offset, and I mean after ^....

If you are not doing anymore lowering and camber why go with these wheels? I say sell them and buy something that allows you to run proper sizes with no issues...
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      12-02-2010, 08:59 PM   #5
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Quote:
Originally Posted by Martin_D View Post
255/Front
285/Rear

You will rub at full lock on the passenger front fender liner with that offset, and I mean after ^....

If you are not doing anymore lowering and camber why go with these wheels? I say sell them and buy something that allows you to run proper sizes with no issues...
20 * 8.5 +15 will rub in the front at full lock?

Don't understand the second part- I was never planning on lowering or any suspension mods for that matter so that is irrelevant... and I do want to run proper sizes, hence me asking here how to make it work. I will NOT run stretched skinny tires if that is what you meant.
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      12-02-2010, 09:07 PM   #6
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Quote:
Originally Posted by 11' AW M3 View Post
20 * 8.5 +15 will rub in the front at full lock?

Don't understand the second part- I was never planning on lowering or any suspension mods for that matter so that is irrelevant... and I do want to run proper sizes, hence me asking here how to make it work. I will NOT run stretched skinny tires if that is what you meant.
It depends on tire brand and size. The fact you are not low at all will help, and you will most likely have no issues with rubbing...

et15-21 is what you are talking about now correct?

I am talking about the original sizes you posted - you need camber to make those work.

The second part you aren't understanding, aggressive fitting wheels like the size these wheels are and or will be will look dumb not lowered. Going with an aggressive wheel offset needs to be backed up with an aggressive stance.
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      12-02-2010, 09:27 PM   #7
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Quote:
Originally Posted by Martin_D View Post
It depends on tire brand and size. The fact you are not low at all will help, and you will most likely have no issues with rubbing...

et15-21 is what you are talking about now correct?

I am talking about the original sizes you posted - you need camber to make those work.

The second part you aren't understanding, aggressive fitting wheels like the size these wheels are and or will be will look dumb not lowered. Going with an aggressive wheel offset needs to be backed up with an aggressive stance.
Ahh, okay. The subtle drop on the zcp is enough for me. I saw a couple pics of 20s on the stock zcp drop and it looks decent. I had my e46 slammed on tein coils, and I definitely don't want to mess with all that again. Kind of grew out of the whole having a handicapped car. Plus, the zcp handles so well, don't want to fock it up with crappy springs (I have ridden in m3 with both h&r and rsport and they both felt like crap).

anyway, back to my original question...

To summarize. If I made no alterations and kept the wheels exactly how they are, I will rub at full lock in the front, but will be fine in the rear, correct? If I rebarreled the fronts (either replacing just the outer or both inner/outers), I will have 0 rubbing issues?

As for tire, I would go with either ps2, vredestein, or hankook. Leaning toward the vreds, but I think they have squared sidewalls which may increase the chances of rubbing. Any suggestions? I don't know of any decent tires that have round sidewalls. 452s and invos are garbage...
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      12-02-2010, 09:35 PM   #8
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20x9 et9 will rub without -2 degrees of camber. People that tell you otherwise are full of shit. I have tried it...

20x10 et14 you should run either 275 or 285 to avoid rubbing issues. Some have rubbed at 20x10 et18 with a 285 so be careful...

I would go with the Hankook V12. They are rounded, are comfortable, and are easy on the wallet!

Edit: BTW if you are worried about killing the ride, why the hell you installing 20s? They are heavy as hell. Trust me again, I have had BBS, HRE, DPE all in 20" size and removed them after a week or less. Accelerating, braking, turning is all "numb" when you make the jump to 20". Once again people that tell you otherwise are full of shit and need to go for a ride with 18" wheels.
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      12-02-2010, 09:41 PM   #9
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Quote:
Originally Posted by 11' AW M3 View Post
First off, thanks for the reply.

I don't want to make any camber adjustments or any suspension modifications, so basically I should definitely get the fronts rebarreled, correct? Do you recommend me doing the inner and outer barrels for an offset of ~21 or could I get away with just replacing the outers and run a ~15 offset? The rim would only be 8.5" wide (2.5 outers, 6 inners).

Rears are fine, yea?

Which tires sizes would you recommend for the rears and the fronts (if rebarreled to your recommendation)?

Thanks!
If it's 8.5 ET 15 that's fine. 21 would be too tucked in. Rears should be no issue unless you run very wide tires. I would recommend running either 245/275 or 255/275. 255/275 may be better on the handling department, but 255 is still pretty wide to run on an 8.5

Now as for tires, Vreds are probably best choice (given price/performance). PS2s also but more expensive. Hankook might as well burn them...

Vreds run a tad skinny so a 255 would work.

Remember though - 255/30/20 is TALLER as well as wider than 245/30/20 so that may add to your rubbing woes, but this is really not an issue with an 8.5 ET15.

Gluck
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      12-02-2010, 09:42 PM   #10
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Quote:
Originally Posted by Martin_D View Post
20x9 et9 will rub without -2 degrees of camber. People that tell you otherwise are full of shit. I have tried it...

20x10 et14 you should run either 275 or 285 to avoid rubbing issues. Some have rubbed at 20x10 et18 with a 285 so be careful...

I would go with the Hankook V12. They are rounded, are comfortable, and are easy on the wallet!

Edit: BTW if you are worried about killing the ride, why the hell you installing 20s? They are heavy as hell. Trust me again, I have had BBS, HRE, DPE all in 20" size and removed them after a week or less. Accelerating, braking, turning is all "numb" when you make the jump to 20". Once again people that tell you otherwise are full of shit and need to go for a ride with 18" wheels.

Last edited by GewoW; 12-02-2010 at 10:08 PM..
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      12-02-2010, 10:58 PM   #11
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Quote:
Originally Posted by Martin_D View Post
20x9 et9 will rub without -2 degrees of camber. People that tell you otherwise are full of shit. I have tried it...
Thanks for the confirmation. Did you run 245/30 or 255/30 when you rubbed with that setup?
20x10 et14 you should run either 275 or 285 to avoid rubbing issues. Some have rubbed at 20x10 et18 with a 285 so be careful...

I would go with the Hankook V12. They are rounded, are comfortable, and are easy on the wallet!

Are the sidewalls rounder than vredesteins?
Edit: BTW if you are worried about killing the ride, why the hell you installing 20s? They are heavy as hell. Trust me again, I have had BBS, HRE, DPE all in 20" size and removed them after a week or less. Accelerating, braking, turning is all "numb" when you make the jump to 20". Once again people that tell you otherwise are full of shit and need to go for a ride with 18" wheels.
You sure about that? I bet the 20s weigh in very close to my 19" zcp's. The difference between 18 and 20 may be huge, but I doubt the difference between 19s and 20s is that noticeable... I have tried to avoid modding, and I love my powdercoated zcp setup, but I just got that urge and jumped on the HRE's. I am keeping my 19s and will prob swap often. Worst comes to worst I will sell them

Quote:
Originally Posted by GewoW View Post
If it's 8.5 ET 15 that's fine. 21 would be too tucked in. Rears should be no issue unless you run very wide tires. I would recommend running either 245/275 or 255/275. 255/275 may be better on the handling department, but 255 is still pretty wide to run on an 8.5

21 would have been the offset if I changed the inner and outer barrel. The rim would have remained 9" wide. I don't think that is a cost effective route, though. Especially since you guys confirmed just replacing the outer (and thus have offset of +14) will work

Now as for tires, Vreds are probably best choice (given price/performance). PS2s also but more expensive. Hankook might as well burn them...

Vreds run a tad skinny so a 255 would work.
I thought the vreds ran wider and tend to have a squared sidewall...
Remember though - 255/30/20 is TALLER as well as wider than 245/30/20 so that may add to your rubbing woes, but this is really not an issue with an 8.5 ET15.

Gluck
Sounds good. Thank you both very much for your help!
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      12-02-2010, 11:13 PM   #12
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Quote:
Originally Posted by 11' AW M3 View Post
You sure about that? I bet the 20s weigh in very close to my 19" zcp's. The difference between 18 and 20 may be huge, but I doubt the difference between 19s and 20s is that noticeable... I have tried to avoid modding, and I love my powdercoated zcp setup, but I just got that urge and jumped on the HRE's. I am keeping my 19s and will prob swap often. Worst comes to worst I will sell them



Sounds good. Thank you both very much for your help!
the offset to work is dependent on the width so i am not sure if your ET14 is for an 8.5 or a 9.

I would say that upper limit would be the following for the front: 8.5 ET10 = 9.0 ET16 = 9.5 ET22. This is pretty damn aggressive.

Also, here is a pic of a 275 on a 9.5'' wheel. So a 255 on an 8.5 would look basically like this +/-
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      12-02-2010, 11:35 PM   #13
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Quote:
Originally Posted by GewoW View Post
the offset to work is dependent on the width so i am not sure if your ET14 is for an 8.5 or a 9.

I would say that upper limit would be the following for the front: 8.5 ET10 = 9.0 ET16 = 9.5 ET22. This is pretty damn aggressive.

Also, here is a pic of a 275 on a 9.5'' wheel. So a 255 on an 8.5 would look basically like this +/-
let me clarify. Currently 9" wide et9. Changing outer barrel to 2.5" instead of 3" will make it 8.5" wide et15. If I changed both in the inner and outer (2.5 outer, 6.5 inner) it would be 9" wide et21.

Thanks for those reference points. Could you provide the same for the rear? I am just curious in case I decide to make another spur of the moment decision
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      12-03-2010, 12:14 AM   #14
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Yeah it's simply +6 for every 1/2'' increase in width. This is to remain at the same location on the outside. Of course, you lose 1/2'' of clearance on the inside.

I would say upper edge of aggressive for the rear would be 10.0 ET13 = 10.5 ET19 = 11 ET25. But this is really pushing it. Remember though - if you don't use a wide-ass tire, it can work OK. E.g. a 295 on a 10.0'' with that offset will fit worse than (may not even...) a 275, or even an equivalent 295 on a 10.5''.
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      12-04-2010, 07:11 PM   #15
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Thanks again gewow.

So I fitted the wheels yesterday to get an idea... you guys weren't lying about the fronts. WAY too aggressive. They stick out approx. 1/2" past the fender (maybe a bit less). 10mm or so higher offset would be perfect, however. The rears are perfectly fine, plenty of room and VERY flush. It may be sticking out a tiny tiny bit, but its so subtle you can't notice it.

Conclusion: fronts absolutely have to be rebarreled. There is no way in hell that is going to work unless I ran a skinny tire and crazy camber which is retarded IMO (martin and gewow you guys hit it right on the money). No pt in buying an m3 if I was planning on doing that. Now I just need to source 2.5" outer barrels...

As for tire size, I am debating on what to do in the rear. The fronts I think I will be fine with a 255/30 (don't need to step down to 245), but the rears I am a bit concerned about going 285.

I have one last question regarding lugs... what is going to be the proper size lugs to use for the fronts (8.5" +14)?

TIA!
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      12-04-2010, 07:14 PM   #16
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Quote:
Originally Posted by 11' AW M3 View Post
Thanks again gewow.

So I fitted the wheels yesterday to get an idea... you guys weren't lying about the fronts. WAY too aggressive. They stick out approx. 1/2" past the fender (maybe a bit less). 10mm or so higher offset would be perfect, however. The rears are perfectly fine, plenty of room and VERY flush. It may be sticking out a tiny tiny bit, but its so subtle you can't notice it.

Conclusion: fronts absolutely have to be rebarreled. There is no way in hell that is going to work unless I ran a skinny tire and crazy camber which is retarded IMO (martin and gewow you guys hit it right on the money). No pt in buying an m3 if I was planning on doing that. Now I just need to source 2.5" outer barrels...

As for tire size, I am debating on what to do in the rear. The fronts I think I will be fine with a 255/30 (don't need to step down to 245), but the rears I am a bit concerned about going 285.

I have one last question regarding lugs... what is going to be the proper size lugs to use for the fronts (8.5" +14)?

TIA!
lugs are same size if there's no spacer

as for 285..forget that. go 275. will give you nice balance too and keeps the +20 stock tire size offset. 275/30/20
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      12-06-2010, 03:39 PM   #17
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gewow, I think I will go with 275 in the rear.


Does anyone know where I can purchase an outer barrel beside HRE? They are quite expensive from them... I need a 20" 2.5" outer...
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      12-08-2010, 01:27 PM   #18
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You can run those sizes without any rubbing at all. All you need to do is run 245 width tires in front and 275 width tires in rear. I have a 9 ET7 front and 10 ET8 rear and no rubbing at all.
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      12-08-2010, 06:04 PM   #19
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Quote:
Originally Posted by Dustin@AEperformance View Post
You can run those sizes without any rubbing at all. All you need to do is run 245 width tires in front and 275 width tires in rear. I have a 9 ET7 front and 10 ET8 rear and no rubbing at all.
Dustin,
Do you have any pictures of your fronts? What brand of tire are you running? Did you adjust your camber and do you have aftermarket suspension?

When I mounted on the front for a test fit, it actually stuck out and looked like it would hit at full lock. I didn't think there was any way for it to work

TIA!
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      12-08-2010, 06:47 PM   #20
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at one point i was running 19 x 9 wheels with 13 et front and 245/35/19 ad08s and let me tell you it was real damn close, so 9 et WILL not work unless you go 235.

as far as rear youll be ok but i dont know your setup is going to look retarded without a slam, itll look way to agressive
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      12-08-2010, 07:18 PM   #21
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Quote:
Originally Posted by 1cleanm3 View Post
at one point i was running 19 x 9 wheels with 13 et front and 245/35/19 ad08s and let me tell you it was real damn close, so 9 et WILL not work unless you go 235.

as far as rear youll be ok but i dont know your setup is going to look retarded without a slam, itll look way to agressive
the ad08s run really wide though and thus are known to be prone to rubbing... your 245 was like a 255 in other brands.

I am having second thoughts anyway, I am debating on putting them up for sale here, esp if they will work without modifications. Plus, like you said, if I kept them like they sit now they will look horrible in the front without a slam (which I don't want to do).
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      12-08-2010, 07:42 PM   #22
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Quote:
Originally Posted by 11' AW M3 View Post
Dustin,
Do you have any pictures of your fronts? What brand of tire are you running? Did you adjust your camber and do you have aftermarket suspension?

When I mounted on the front for a test fit, it actually stuck out and looked like it would hit at full lock. I didn't think there was any way for it to work

TIA!
Here are pictures of a shoot we did of my car. The tires are Hankook Ventus V12 Evo's. They run pretty true to size, versus AD08' which run relatively large.

I'm lowered on H&R Race springs, and have not changed any camber settings. The front will not rub, I'm sure of it. When the suspension is compressed it cambers in anyway. I have NEVER rubbed in the front.

Is your suspension stock? I recommend lowering the car before putting aggressive wheels on. They will look funny and will stick out more.

Here are a few pics of my car.





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