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Which size tires should I run?

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Old Sep 11, 2008 | 11:17 AM
  #1  
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With my 20" wheels about to arrive, I'm debating which size tires to run.

Here are the two choices:

1) 255/35/20 & 285/30/20

2) 255/30/20 & 285/25/20

It's all about the profile size. I know the lower profile looks better, but having more rubber on my sidewalls might keep these wheels out of harms way for the next couple of years.

What do you guys think?
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Old Sep 11, 2008 | 11:23 AM
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Originally Posted by C's Bimmer' post='667192' date='Sep 11 2008, 02:17 PM
With my 20" wheels about to arrive, I'm debating which size tires to run.

Here are the two choices:

1) 255/35/20 & 285/30/20

2) 255/30/20 & 285/25/20

It's all about the profile size. I know the lower profile looks better, but having more rubber on my sidewalls might keep these wheels out of harms way for the next couple of years.

What do you guys think?
+1 on #1 set-up. I'd run those if I wouldn't rub, but I'm just a lowly E60, not an M5

EDIT:
Plus, isn't set-up #1 the right sidewall ratio for the M5?
Btw, can you go 295 on the rear?
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Old Sep 11, 2008 | 11:27 AM
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Originally Posted by mrfva' post='667195' date='Sep 11 2008, 03:23 PM
+1 on #1 set-up. I'd run those if I wouldn't rub, but I'm just a lowly E60, not an M5

EDIT:
Plus, isn't set-up #1 the right sidewall ratio for the M5?
Btw, can you go 295 on the rear?
I can do 295 in the rear, but I would then have to do a 25 profile tire in the rear and 30 in the front.

Member EuroCarFan and Nigxdoof have the 35/30 profile set-up on their RAD's. However, poleposition and a bunch of others have 30/25 on their 20's.
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Old Sep 11, 2008 | 11:29 AM
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stop it... DO THE 295 ... the car is begging for it.... it would look crazy and wide as hell...
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Old Sep 11, 2008 | 11:43 AM
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Originally Posted by C's Bimmer' post='667192' date='Sep 11 2008, 10:17 PM
With my 20" wheels about to arrive, I'm debating which size tires to run.

Here are the two choices:

1) 255/35/20 & 285/30/20

2) 255/30/20 & 285/25/20

It's all about the profile size. I know the lower profile looks better, but having more rubber on my sidewalls might keep these wheels out of harms way for the next couple of years.

What do you guys think?

You don't win anything with wider front tires - 255/30/20

Rears can be a bit wider, but too wide is not good for anything - 295/25/20

Those tires would be within the OEM specs, but don't drive into potholes.


The wheels should be suitable for the tires, F 9.0 and R 10
and the ET's right, F about 12 and R about 28 (look out for rubbing).

The tires should also have "rim defence".
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Old Sep 11, 2008 | 12:07 PM
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Calton,
You can't run option #2. If you do, you'll be out of BMW specifications. E60 M5s are designed to have a larger rolling diameter than regular e60s, so 255/35/20 and 285/30/20 for you.
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Old Sep 11, 2008 | 12:17 PM
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Originally Posted by C's Bimmer' post='667202' date='Sep 11 2008, 02:27 PM
I can do 295 in the rear, but I would then have to do a 25 profile tire in the rear and 30 in the front.

Member EuroCarFan and Nigxdoof have the 35/30 profile set-up on their RAD's. However, poleposition and a bunch of others have 30/25 on their 20's.
That's correct. AFAIK, the ratio between non-M5 vs. M5 is slightly different -- as you mentioned EuroCarFan (M5) is running 35/30 vs. all others non-M5 running 30/25.
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Old Sep 11, 2008 | 02:35 PM
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Originally Posted by vegastrashed' post='667248' date='Sep 11 2008, 04:07 PM
Calton,
You can't run option #2. If you do, you'll be out of BMW specifications. E60 M5s are designed to have a larger rolling diameter than regular e60s, so 255/35/20 and 285/30/20 for you.
What are the consequences of being out of spec? Joe - You are one sick individual. You're like that kid in the movie Darryl. Remember that movie? He was that prototype robot kid that the Navy designed and was adopted by that suburban family? Or wait...you could be more like... Data from the Goonies. Yep, that's it. You're Data. Just filled with a plethora of knowledge. Gotta love it!
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