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Widest Tire on Stock 18s

Old 03-08-2007, 12:28 AM
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Riven02
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Default Widest Tire on Stock 18s

I know this has been covered but I am not finding it. I know I am newbing it up ATM....

What is the widest tire I can fit on the stock 18" wheels? I am thinking of some BFG KDs.
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Old 03-08-2007, 01:02 AM
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classj
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Default RE: Widest Tire on Stock 18s

I would not go wider than 255-45-18 if you are interested in handling.

Even that is a tad wide for an 8.5" rimif you were road racing and trying to minimize tire squirm.

But it is perfectly fine on the street, and approx in the middle of the rec rim range for the tire.

You may want to look into the goodyear f1's. The GS-D3's and the supercar's for that matter are pretty nice tires.
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Old 03-08-2007, 02:16 AM
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mygt500
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Default RE: Widest Tire on Stock 18s

1+ good advice but if keeping to the street go big and staggered....looks great and a big contact patch will help off the line (as well as stiffer rear suspension). J
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Old 03-08-2007, 04:06 PM
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mAnYsTyLeS
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Default RE: Widest Tire on Stock 18s

I just want to change my rear tires to wider ones (on stock 18 wheels)but I can't find 255/50/18's......anybody know why????
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Old 03-08-2007, 04:14 PM
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ohsixgt1217
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Default RE: Widest Tire on Stock 18s

try a 255/45/18
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Old 03-08-2007, 04:28 PM
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mAnYsTyLeS
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Default RE: Widest Tire on Stock 18s

Yeah, but I would like the side walls to be the same height. My car is not lowered soit might look a little silly to get different wall sizes.
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Old 03-08-2007, 04:36 PM
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bascho
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Default RE: Widest Tire on Stock 18s

ORIGINAL: mAnYsTyLeS

Yeah, but I would like the side walls to be the same height. My car is not lowered soit might look a little silly to get different wall sizes.
Not all 45-series or 50-series (or any other side wall for that matter) have the same side wall height. The 50 represents 50% of the tire width. The 45 represents 45% of the tire width.

So basically, a 255/50 tire may bave the same side wall as a 265/45 or a 275/40.
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Old 03-08-2007, 05:05 PM
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Scotty07
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Default RE: Widest Tire on Stock 18s

ORIGINAL: bascho

ORIGINAL: mAnYsTyLeS

Yeah, but I would like the side walls to be the same height. My car is not lowered soit might look a little silly to get different wall sizes.
Not all 45-series or 50-series (or any other side wall for that matter) have the same side wall height. The 50 represents 50% of the tire width. The 45 represents 45% of the tire width.

So basically, a 255/50 tire may bave the same side wall as a 265/45 or a 275/40.
The math does not work out that way.

Examples:
A 255/50/18 means the 50% of 255mm, or 127.5mm, or approx. 5 inch sidewall.
A 265/45/18 means 45% of 265mm, or 119.2mm, or approx. 4.7 inch sidewall.
A 275/40/18 means 40% of 275mm, or 110mm, or approx. 4.3 inch sidewall.

Then there is the overall diameter difference. The 255 is about 28 inches tall, the 275 about 26.7 inches tall...
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Old 03-09-2007, 08:43 PM
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Default RE: Widest Tire on Stock 18s

I am in the tire industry, I have on the stock 18" 255/45R18 in the front and 285/40R18 in the rear. The rear tires do not have any tread bulge and about a 1/4" side expansion. No Problems.
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Old 03-09-2007, 11:47 PM
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Stkjock
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Default RE: Widest Tire on Stock 18s


mAnYsTyLeS

the 255/45's are the same diameter as the stock 235's so they should not look very different IMO


SSP 07
wow 285's on the stock 18's... that sounds like a lot of rubber for 8.5" rims.. reco rim is 10" w/ min of 9.5" according to the Nitto and BF Goodrich sites... the diameter is almost spot on....if they work that's great!

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