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Old 07-21-2015, 09:32 PM   #1
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Increasing tire size....benefits or problems?

I've heard that when replacing tires, some owners elect to increase the size of their new tires. What are the pros and cons of doing this and what is the maximum increase one might go to from an original size of 275 x 70 x 22.5?
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Old 07-21-2015, 09:36 PM   #2
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I went to 305/70's on the front since that was what was needed to use the increased carrying capacity of the new 14,600# front axle on the previous Dutch Star. The 305's were only " taller and a little wider so the cleared the wheel wells EXCEPT when aired down.
With the 275's I needed 125 psi, with the 305's I went down to 105.
I also had to go to wider rims since the tires needed that plus I got used Alcoa's to replace the steel ones.
As to what the maximum is: that will totally depend on the clearances on your rig. Ours was pretty tight and anything much bigger would have needed cutting.
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Old 07-22-2015, 02:41 PM   #3
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Except for those who jusyt love tobrag about having bigger tires, the reason for a size upgrade is get more load carrying capacity. If your present tires can carry the max axle load (GAWR) with a bit of extra margin for safety, there is no reason to upgrade the size.

Well, maybe one other reason if the OEM tire is an limited-use size. Switching to a more common size, one used on the more numerous commercial vehicles, may make the tire easier to replace and cheaper too.

So don't change the tire size unless you have a specific reason to do so.
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Old 07-22-2015, 05:09 PM   #4
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The bad part of 275/70's is that you really don't have a tire choice that doesn't result in a taller tire (whereas you can go from a taller 255/80 to a shorter sidewall of the 275/70 and typically end up with the same diameter tire, just 3/4" wider).

Unless you are loaded to 100% on the 275's, I don't think I'd hassle trying to go to a larger setup.

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Old 07-22-2015, 09:42 PM   #5
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Quote:
Originally Posted by SteveLevin View Post
The bad part of 275/70's is that you really don't have a tire choice that doesn't result in a taller tire (whereas you can go from a taller 255/80 to a shorter sidewall of the 275/70 and typically end up with the same diameter tire, just 3/4" wider).

Unless you are loaded to 100% on the 275's, I don't think I'd hassle trying to go to a larger setup.

Steve

Gentlemen......thanks so much. I think I need to get a better handle on my load and my tires ability to handle it. Your comments are most appreciated.
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