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Old 07-08-2011, 10:10 AM   #1
shaker954
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Talking 255/40/18

WILL A 255/40/18 FIT ALL THE WAY AROUND ON THE G8 WITH STOCK RIMS AND NO SPACER ,JUST WANT TO THROW SOME TIRES ON .THANKS GUYS
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Old 07-08-2011, 11:36 AM   #2
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Should be no problem. I'm thinking of getting 255/45R18 as my next tires (a bit taller to improve tire life and fuel economy ^_^).
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Old 07-08-2011, 12:37 PM   #3
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changing to 255/40/18 will fit, but the tires will be smaller in diameter making the speedo show faster than actually traveling. The difference will be about 2.5% meaning when your speedo shows 70, you will actually be going about 68. It is not a big change and the increased width is about 3/8 inch. Half of that will be inside the wheel well. I think 255s look better than 245s on stock rims, but I would go 255/45/18 if I were you. The difference there would be 1% the other way. 70 on the speedo would be almost 71 real speed.
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Old 07-08-2011, 01:38 PM   #4
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Do 255/45/18
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Old 07-08-2011, 04:48 PM   #5
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U guys are great thanks alot . I thought I would have to do 40s because of rubbing . But if 255/45/18 don't rub , well that sounds better . I just didnt want to add any spacers
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Old 01-09-2013, 03:45 PM   #6
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Shaker954: Did the 255/45/18 work out ? I'm considering a new BF Goodrich G-Force Sport Comp 2 summer in this exact size on an '09 G8 GT. Tire Rack rates this tire exceptionally well.
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Old 01-09-2013, 09:58 PM   #7
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I will let u know , tires are at buddy's house , going tomorrow
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Old 01-09-2013, 10:34 PM   #8
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265/40/18 doesn't rub with the stock wheels and stock ride height.
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Old 01-09-2013, 11:18 PM   #9
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255/45/18 all the way around, works,
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Old 01-10-2013, 12:23 AM   #10
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You need to consider how wide of wheel you are using and manufacture of tire max width range for rim width size. If u start going wider tire on a wheel that is too narrow you are going to destroy the edges of the tires.
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Old 01-10-2013, 07:23 AM   #11
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I never had a problem , ran them for a year untill I got my camaro rims , car looks good with 255 all the way around
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Old 01-10-2013, 07:28 AM   #12
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Shame I missed this thread. I've been running 255/45/18's General UHP tires on chromed 6 Cyl rims for 2 years now without any problems.
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Old 01-10-2013, 07:36 AM   #13
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How much wider than a 255 would you go on a 8" wide rim?
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Old 01-10-2013, 08:29 AM   #14
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On our stock rim you could probably get away with 265/40. I would say a 265/45 would be too tall.
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RotoFab CAI, HSRK, MagnaFlow cat back, Kooks 1 7/8 mids w/HFC, GXP Brembos with drilled rotors, VMS Stage 2 tuned, Mobil 1
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Old 01-10-2013, 08:39 AM   #15
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Yes 265 is probably the max on stock rim, I run NT05s 265/35 all around. No rubbing and im lowered on H&R springs. Though im pretty sure I heard/read of someone getting a 275 on it, But thats pushing it.
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Old 01-10-2013, 09:08 AM   #16
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As an example on the front I can just about get a finger between the top of the tire and the spring plate. On the inside I'm about a 1/4 in away from the strut. Plenty of room in the back so as Monte said you can go with a 275 on a stock rim.
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RotoFab CAI, HSRK, MagnaFlow cat back, Kooks 1 7/8 mids w/HFC, GXP Brembos with drilled rotors, VMS Stage 2 tuned, Mobil 1
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Old 01-10-2013, 02:31 PM   #17
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I had at one point 275s on rear , buddy of mine gave them to me . They were low pro... I don't remember side wall size ...... Car looked mean from back , wide stance
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Old 01-10-2013, 06:39 PM   #18
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Here is how my 275-35-18 fits on a stock 18. These are my Pilot PS2 track tires and wheels. They fit with very little sidewall hanging out. Almost a perfect fit. I have a set of 285-35-18s that I'm gonna mount on back.


Sent from my fresh lubed iPhone
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Old 01-10-2013, 07:02 PM   #19
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Sick ...... I have 285/30/20 Invos on my camaro 20s
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Old 01-10-2013, 07:18 PM   #20
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The pilots are good tires
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