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Old 02-19-2016, 02:24 PM   #1
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New Tires For My TV

I have a 2010 GMC 1500 p/u and just purchased a 2005 25Z. My factory trucks tires are about do for replacement. They are P245/70R17s now. I plan on installing LT tires. The tire store told me that a LT 265/70R17s are more common for this size truck. There is less than $10.00 difference in the price per tire. Has anyone made this tire size change and how did it work out?
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Old 02-19-2016, 02:41 PM   #2
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I went from 245 to 265, primarily for looks, and have no issues. Wish I went to 285, again for looks, but was concerned about the increased fire size having a negative affect on towing performance do to increased final drive ratio.

If I was to do it again, I would have 285 since there was no noticeable impact at 265.
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Old 02-19-2016, 02:59 PM   #3
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I also went from 245 (LT245/75R16E) to 265 (LT265/75R16E) on our previous TV - 2006 GMC 25OOHD, same as clubhouse indicated - primarily for looks.

The change had no impact on ride or towing.
But it did impact the speedometer reading by ~2mph
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Old 02-19-2016, 04:55 PM   #4
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It seems very likely the diesel TVs in the group would have little problem changing to larger tire sizes.

I had a class B; E-250, V8, automatic. I changed to a larger LT tire for the looks. Loved the look, but any highway uphill ability went into the crapper! When those tires needed replacing, I went back to the OEM (smaller) size in an LT tire. Didn't care for the looks with the smaller tires, but I hated the downshifting on moderate highway hills with the larger tire size. (Sorry. I don't have info on the various tire sizes or rear axle ratio.)
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Old 02-19-2016, 06:45 PM   #5
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yeah all depends on gears and rpms, I went larger on my last diesel to try to lower rpms on highway. I was at 2400 at 70 and didn't like running that high
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Old 02-22-2016, 10:31 PM   #6
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new tires

Are the 265s wider or taller then the 245s?
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Old 02-22-2016, 10:57 PM   #7
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Old 02-23-2016, 05:40 AM   #8
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Be careful putting on larger tires. It is the same thing as taking gear out of the truck, and it hurts towing performance.

At the very least, if you go to the larger tires, get the computer reprogrammed for the larger tires so the truck will at least know what it's dealing with.
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Old 02-23-2016, 05:58 AM   #9
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Sawdust,

What is the specs of your truck drivetrain wise? 5.3/6spd/3.42, or 4.8/4spd/???, or ???

The 245/265 is the width of the tire, while the sidewall height is the 70 which is 70% of the width of the tire.

If you have the 5.3/6spd/3.42, you should be fine. Look in your glovebox for the gear code.
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Old 02-23-2016, 06:37 AM   #10
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Quote:
Originally Posted by etex211 View Post
Be careful putting on larger tires. It is the same thing as taking gear out of the truck, and it hurts towing performance.

At the very least, if you go to the larger tires, get the computer reprogrammed for the larger tires so the truck will at least know what it's dealing with.
X2 - if you don't reprogram the computer when changing tire size (circumference), your speedometer and shift points/convertor lockup will all be off. A slight change may not be too noticeable, but they will be off none the less...
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