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Discussion Starter #1
I have an 03 Lightning, it has factory wheels on it and 295/45/18 size tires on it. I was curious if any of you FORD lovers knew what width that rim is and if I could put a 305/40/18 size tire on it for a little extra meat in the back. Will it fit and will it work?
 

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Hey there,

The rim is an 18x9 and the 305/40/18 is going to give you a 3% difference and probably won't work with the 18x9 rim. You could consider moving up to a 22x10.5 rim which I believe was an option for that Truck and run a 285/35/22 tire.

Hope that helps. :)
 

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Discussion Starter #3
Miss Information,

Thank you very much for the info, I appreciate it greatly. I wanna try and stick with the 18's. I had 22 's on my old 2000 F150, would rather the 18's.

03 Lightning wit a lil KB on top
 

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I would go smaller on the front wheels/tires to give it the agressive look!
 

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I have 325's on my 18x9 wheels so I dont see why 305's wouldn't fit.
 

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I have 325's on my 18x9 wheels so I dont see why 305's wouldn't fit.
I did not say it wouldn't fit.

What I said was it would give a 3% difference and probably wouldn't work. When changing tire sizes, it is recommended that one stay within 3% of the diameter of the original tire, as any more than this and one could possibly face the risk of brake failure.
 

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are you saying abs would fail ?
No I am not saying that. Nor do I have a thorough enough working knowledge on the Anti-Lock Braking System to offer anything more than a basic understanding of it. Perhaps a more experienced or knowledgeable member could answer that.

What I said was
any more than this and one could possibly face the risk of brake failure.
Not that it WOULD, but that it COULD... it is a recommendation or a warning by the Tire Companies, I was simply stating or for lack of better words, "repeating" their recommendation.

I apologize if I have confused anyone, I was only trying to help the first time and clarify myself the second time.
 

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Rusty, et al.
It seems to me that the manufacturer's recomendation that MissInformation quoted causing brake failure is due to the ffact that the larger the diameter of the tire, the greater torque advantage it has over the braking system. Kinda like the difference of using a ratchet wrench, or a breaker bar on a lug nut.

No, going to a larger tire will not affect the ABS.

However going with larger tires in the rear, and smaller ones in the front will make the ABS puke all over itself. THe abs kicks in when it notes a difference in the speed of the abs sensor from one tire to another.

Also all wheel drive vehicles will have a heart attack if you mix tire sizes. They will think that one size is slipping, and will engage the 4WD.
 

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Also all wheel drive vehicles will have a heart attack if you mix tire sizes. They will think that one size is slipping, and will engage the 4WD.

I didnt realize that the lightnings were all wheel drive. I thought they were only rear.


Increasing the tire size 10 millimeters in width, and then reducing the aspect ratio 5% should keep the diameter close to the same... or am I reading this all wrong? I'll have to go check my math.
 
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