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      02-03-2009, 07:08 PM   #1
ILLCOMM
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Anyone running 285/25/20?

I am worried that the profile is so thin that bending the rim is inevitable.
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      02-03-2009, 10:20 PM   #2
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What size rim will you be running and what brand tire would you want to go with??

Usually 285/25/20 run perfect for 335 but when it comes to the M running a 11" 305/25 would be the best followed by 285/30 for 10.5"

Hope this helps but you can run 285/25
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      02-03-2009, 10:41 PM   #3
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20" tire sizes

Quote:
Originally Posted by ILLCOMM View Post
I am worried that the profile is so thin that bending the rim is inevitable.
Not the best size. 285/25-20s are almost 3/4" smaller OD than stock (3% in circumference). That's 3/8" less sidewall height, so yes, rims would be more vulnerable.

295/25s would be 2% smaller, a better choice, depending on rim width. Or, 285/30s would be about 2% larger, also better, IMO. These specs are all based on PS2s.
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      02-03-2009, 10:47 PM   #4
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I would recommend running a 285/30. This is the recommended tire size for a 20" wheel (20x10.5) and provides a little extra rubber to separate the wheel from the potholes.

This is the setup we recommend to our customers.
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      02-03-2009, 11:13 PM   #5
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I am trying to run 20x10's in the rear.

I am asking about 285/25 R20's because according to this (http://www.1010tires.com/TireSizeCalculator.asp) diameter calculator it's the size of tire/rim the most closely matches the stock 18 setup (only a 2% difference). I'd like to make sure that DSC continues to work.
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      02-03-2009, 11:16 PM   #6
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Quote:
Originally Posted by ILLCOMM View Post
I am trying to run 20x10's in the rear.

I am asking about 285/25 R20's because according to this (http://www.1010tires.com/TireSizeCalculator.asp) diameter calculator it's the size of tire/rim the most closely matches the stock 18 setup (only a 2% difference). I'd like to make sure that DSC continues to work.
Go by actual specs of the tires you are considering, not a generic calculator. As you can see by my examples, other sizes are closer in PS2s. The best piece of data to look at in this regard is the revs/mile, which compares circumference.
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      02-03-2009, 11:24 PM   #7
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Thanks Greg and everyone else.

Generally speaking, I have no problem running 295's as long as they'll fit. I'd prefer to keep from dialing in too much understeer. As such, suggestions on what I can fit up front would be helpful too.

The wheel stats:

F: 20x8.5 +34
R: 20x10 +22
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      02-03-2009, 11:32 PM   #8
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Quote:
Originally Posted by ILLCOMM View Post
Thanks Greg and everyone else.

Generally speaking, I have no problem running 295's as long as they'll fit. I'd prefer to keep from dialing in too much understeer. As such, suggestions on what I can fit up front would be helpful too.

The wheel stats:

F: 20x8.5 +34
R: 20x10 +22
295s are a tad wide for 10s, though they'll fit--the 285/30 option is probably better. 245/30s would be perfect in front, if you want to bias the rear. 255/30 would be another option, though again, the 245s are a better fit for an 8.5" wheel
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      02-04-2009, 12:03 AM   #9
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295 is a lot of rubber for a 10" wide rim. Typically, a 275 is the best fit for a 10" wide wheel in terms of a Non-M E92. A 285 would be my recommendation for this specific situation.
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      02-07-2009, 12:40 PM   #10
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I run 295 on the rears with same wheel size, no problem at all.
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