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post #1 of 5 (permalink) Old 08-21-08, 12:16 PM Thread Starter
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06 F350 Tire Size

Man, I hope someone has the answer to my questions. I have a 2006 F350 Dually that I pull my 5th wheel with. I want to replace the factory tires with some larger mud terrain tires. The factory tires are BF Rugged Trail LT245 75R17 on the factory wheels (I believe 17 X 7.5). I like the factory wheels and just want a slightly larger, more aggresive tire.

What is the largest mud tire I can put on there without spacers or a lift kit?

Can I go to an LT255 75R17 without the back tires rubbing?

Thanks in advance....

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post #2 of 5 (permalink) Old 08-21-08, 12:56 PM
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Re: 06 F350 Tire Size

The 255's are just a tad bit taller than the 245's. The width "75" would be pretty much the same. They shouldnt rub each other. Now if you went to a 255/70 you might have a rubbing issue.
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post #3 of 5 (permalink) Old 08-22-08, 11:56 AM Thread Starter
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Re: 06 F350 Tire Size

Quote:
Originally Posted by jwko View Post
The 255's are just a tad bit taller than the 245's. The width "75" would be pretty much the same. They shouldnt rub each other. Now if you went to a 255/70 you might have a rubbing issue.
255 IS THE WIDTH.......75 IS THE PROFILE.

255/75 R17 - The first number is the width of the tire in millimeters, measured from sidewall to sidewall. The second number is the aspect ratio. This is a ratio of sidewall height to width. The R17 is the wheel diameter.
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post #4 of 5 (permalink) Old 08-22-08, 02:21 PM
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Re: 06 F350 Tire Size

Im 40 years old and I always thought the "75" was the width. You are correct! Shows how much I know about tires.
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post #5 of 5 (permalink) Old 08-26-08, 07:46 AM Thread Starter
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Re: 06 F350 Tire Size

Thanks for the input though! I've shot this question around on other forums and I haven't found anyone who has tried to go up a little in width on a dually without doing a lift kit and spacers. I did find out that there is less than 1/2 inch difference between a 245/75 and 255/75, so it would fit (but probably wouldn't make much difference in appearance). The problem I have now is that the only 255/75 I've found has a load rating of "C" rather than the standard "E". This is too much work!! LOL!! I'm just going to put the stock size on it and go to an All-Terrain tire.
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