What size tires can I run on stock 18 X 8.5?
Login  | |
|
|
|
|
|
RE: What size tires can I run on stock 18 X 8.5? - 1/21/2008 7:03:04 PM
|
|
|
brad281
Posts: 882
Joined: 3/15/2007
Status: offline
|
I'm running 245s on my 20s up front. 20x 8.5 I am satisfied with my bfgs. 295s wouldn't fit 8.5"s. I am running 275s out back on a 10" wide wheel. For the fronts, I'd go with either a 245 or 255.
|
|
|
|
|
RE: What size tires can I run on stock 18 X 8.5? - 1/21/2008 7:09:27 PM
|
|
|
UrS4
Posts: 843
Joined: 3/12/2006
Status: offline
|
You can't fit a 295 on a 8.5 wide rim.
But you can run 255/45/18 front and back. It will be safe, look good, and not change your speedo.
_____________________________
06 GT 5spd manual DOP 3/31/06
Mods: JLTII/SCT Xcal2, Brenspeed tune, 4.10s, UDPs, Spydershaft, Pypes O/R X pipe & Mid muffler system, Stoptech Stage 1 brake kit, Hurst shifter, 255/50/17 tires, 14" shorty antenna. 94' Audi S4 330hp . . .sold
|
|
|
|
|
RE: What size tires can I run on stock 18 X 8.5? - 1/21/2008 7:15:35 PM
|
|
|
07 S197
Posts: 253
Joined: 12/12/2007
From: hampton,va
Status: offline
|
Go with a 275 or 285 in the rear
_____________________________
07 satin silver gt
484whp 425wtq
BRENSPEED PAXTON H.O.
>MID MUFFLER CREW<
>>PAXTON CREW<<
12.5@118 on stock 235bfg''''''''s
11.93@117 on et street radials
|
|
|
|
|
RE: What size tires can I run on stock 18 X 8.5? - 1/21/2008 7:24:22 PM
|
|
|
howarmat
Posts: 11056
Joined: 9/16/2006
From: Fishers, IN
Status: online
|
you cant really fit 285/275 on there safely....i would go 265 max
_____________________________
~Matt
2005 Black GT Stick 1 of 368
its not stock 
mlkzoodomsl
|
|
|
|
|
RE: What size tires can I run on stock 18 X 8.5? - 1/21/2008 7:28:28 PM
|
|
|
07 S197
Posts: 253
Joined: 12/12/2007
From: hampton,va
Status: offline
|
when i was looking for tires at work the minimum rim width for the 275 or 285 was 8.5. Another ford dealer around here put 275's on the rear on a 17 inch rim on a few of there cars for sale and they looked extremely good
_____________________________
07 satin silver gt
484whp 425wtq
BRENSPEED PAXTON H.O.
>MID MUFFLER CREW<
>>PAXTON CREW<<
12.5@118 on stock 235bfg''''''''s
11.93@117 on et street radials
|
|
|
|
|
RE: What size tires can I run on stock 18 X 8.5? - 1/21/2008 7:39:28 PM
|
|
|
BullittLou
Posts: 26
Joined: 1/21/2008
Status: offline
|
Does going from a 27 inch tire to a 26 inch tire have a similar impact as you would going from a 373 to a 390 rear?
_____________________________
2008 Black Bullitt
|
|
|
|
|
RE: What size tires can I run on stock 18 X 8.5? - 1/21/2008 8:03:02 PM
|
|
|
howarmat
Posts: 11056
Joined: 9/16/2006
From: Fishers, IN
Status: online
|
If you go to tirerack.com and check out the selection of 275/40 or 285/40 for the 18 rim you will see the minimun wheel size is 9 to 9.5 and yes changing the diameter does change the gearing ratio. Also it you are lowered 1.5" the smaller diameter leads to scraping.
< Message edited by howarmat -- 1/22/2008 2:17:29 AM >
_____________________________
~Matt
2005 Black GT Stick 1 of 368
its not stock
mlkzoodomsl
|
|
|
|
|
RE: What size tires can I run on stock 18 X 8.5? - 1/21/2008 8:13:32 PM
|
|
|
BullittLou
Posts: 26
Joined: 1/21/2008
Status: offline
|
Size 265/40ZR18
Rim 9.5"
Tread
Width 10.0"
Overall
Diam. 26.3"
I think these might work. Slightly over the recommended width...but I really don't think 265s are too wide.
< Message edited by BullittLou -- 1/21/2008 8:16:29 PM >
_____________________________
2008 Black Bullitt
|
|
|
|
|
RE: What size tires can I run on stock 18 X 8.5? - 1/21/2008 8:24:03 PM
|
|
|
Stoenr
Posts: 3474
Joined: 5/21/2005
From: S.burbs Chicago
Status: offline
|
quote:
ORIGINAL: UrS4
You can't fit a 295 on a 8.5 wide rim.
But you can run 255/45/18 front and back. It will be safe, look good, and not change your speedo.
+1
I've seen others install 270/40 and 285/40, sure they got them on there. But handling is sacrificed. And may even be unsafe to a certain extent with the extra sidewall flexing.
_____________________________
WWW.06GT.COM
12.83_107.15
|
|
|
|
|
RE: What size tires can I run on stock 18 X 8.5? - 1/22/2008 1:25:00 PM
|
|
|
Norm Peterson
Posts: 1435
Joined: 2/26/2007
From: Delaware Twp, NJ
Status: offline
|
quote:
ORIGINAL: BullittLou
Size 265/40ZR18
Rim 9.5"
Tread
Width 10.0"
Overall
Diam. 26.3"
I think these might work. Slightly over the recommended width...but I really don't think 265s are too wide.
Too much tire for 8.5's in street use. Period.
Being one whole inch below the minimum is much worse than being half an inch under, especially with the smaller diameter/lower profile (there is less sidewall height to spread the error out over).
There are a few 275/40's that are approved for 8.5" rims, but most tires in that size are not. Just enough more sidewall than 265/40's to make the diffference, I'd guess.
If this was a trailered strictly-show car, or perhaps a very temporary condition of some sort, you could probably get away with it.
Norm
< Message edited by Norm Peterson -- 1/22/2008 1:31:08 PM >
|
|
|
|
|
RE: What size tires can I run on stock 18 X 8.5? - 1/22/2008 1:52:50 PM
|
|
|
Dex
Posts: 2139
Joined: 3/19/2007
Status: offline
|
IMO i wouldnt go bigger than a 255
|
|
|
|
|
RE: What size tires can I run on stock 18 X 8.5? - 1/22/2008 1:54:05 PM
|
|
|
Grabber
Posts: 2137
Joined: 6/5/2007
Status: offline
|
I would agree with Dex. 255 is seriously pushing it. Hell, 245 is as well. The suggest size for 8.5 inch rims is 235. 8.0 rims, 225, etc.
_____________________________
2003 10th Anni Torch Red Cobra
Fluidyne Heat Exchanger
H&R Springs
Rear Differential Cooler
K&N FIPK
Bassani X-pipe and Mac Cat-back
|
|
|
|
|
RE: What size tires can I run on stock 18 X 8.5? - 1/22/2008 5:26:03 PM
|
|
|
Stoenr
Posts: 3474
Joined: 5/21/2005
From: S.burbs Chicago
Status: offline
|
255/45 is perfect
_____________________________
WWW.06GT.COM
12.83_107.15
|
|
|
|
|
Printable Version
