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Old 04-24-2013, 11:53 AM   #1
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Truck Tires size and brand

I am getting my truck ready for the 5th wheel that is coming, about the first of May. I want to replace the tires that are on now. I have a 2003 2500HD 2wd 6.0 liter, short box. The present tires are stock size - LT245 / 75 / 16. I think I should go to 265's. Can anyone help about the size and brand of tire. The truck will not be OFF road. I want an all-season tire. I don't want "cheap" and not overly expensive.

Thanks for any help !!!
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Old 04-24-2013, 12:01 PM   #2
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The positive - you'll pick up some load carrying capacity (reserve) with the larger tires, even though the truck's GAWRs on the driver's door sticker won't change.

The negative - the larger rolling diameter will give you a higher (lower numerically) effective axle ratio, just what you DON'T want for towing with a gas engine.

Everyone has a personal preference with tire brands. I'd go with the Michelin LTX M/S2.

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Old 04-24-2013, 02:09 PM   #3
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Thanks Rusty

The truck does have 4:10 gears. Due you think I will lose much gearing with these if I go to the 265's?
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Old 04-24-2013, 02:16 PM   #4
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According to the Michelin charts, the overall diameter of the 245/75 is 30.5" while the 265/75 is 31.7". The effective change in gear ratio is 1.2" / 30.5" ~ 4%. That would make your 4.10s effectively into 3.94s.

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Old 04-24-2013, 03:17 PM   #5
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The tire size got bigger by 20 mm that would only be a little over 3/4 in
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Old 04-24-2013, 03:34 PM   #6
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20mm is the difference in section width. Sidewall height is section width times aspect ratio. A 245/75-16 section width tire has a sidewall height of 245 x .75 = 183.75 mm. It's theoretical diameter would be 183.75 + 183.75 (it has 2 sidewalls that have to be added in) + 16". 183.75 mm = 7.234", so diameter would be 7.234" + 7.234" + 16" wheel diameter = 30.468" (Michelin says 30.5" actual diameter).

The 265/75-16 has a sidewall height of 265 x .75 = 198.75 mm, or 7.824". Theoretical diameter would be 7.824" + 7.824" + 16" wheel diameter = 31.648" (Michelin says 31.7" actual diameter).

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Old 04-24-2013, 06:17 PM   #7
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Rusty does the math the hard way. Those same Michelin charts also include the tire revs/mile. Here's the easy way:

The difference in percentage of tire revs/mile = the difference in effective axle ratio And on a Ford (I don't know about other brands) the percentage change in revs/mile is also the percentage of speedo error, tripmeter error, and odometer error.

Per the tire specs on Michelinman.com,
Michelin LTX M/S2 tires in size LT245/75R16E have 683 revs/mile.
Michelin LTX M/S2 tires in size LT265/75R16E have 657 revs/mile.

The math:
683 minus 657 = 26, divided by 683 = 3.8%

So Rusty's ~4% wasn't off much, but too much to satisfy an old accountant/MBA.

So if you have a 3.73 axle ratio, it will "feel like" a 3.59 ratio with the taller tires. If your Ford speedo is accurate now, then it will be slow by 3.8% with the new tires. IOW, an indicated 70 MPH will be an actual 72.66 MPH on Officer Bob's radar. When your tripmeter says 400 miles for that tank of fuel, you will have traveled an actual 415.2 miles. (I suspect that's true for GM and Ram too, but I don't know for sure.)

For some trucks your dealer can calibrate your speedo/tripmeter/odometer to be accurate with the new tires. On my '99.5 SuperDuty, I kept my tripmeter calibrated so it was 99.7% accurate so I could accurately manually compute MPG.
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Old 04-24-2013, 06:58 PM   #8
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The size your truck is rated for is on the tag on the door frame.
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Old 04-24-2013, 07:30 PM   #9
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1.2 / 30.5 (Michelin's numbers, not mine) = 3.9344%, which I took the liberty of rounding to ~4%. So, it depends which of Michelin's numbers you use. I suspect Michelin has done some rounding as well.

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Old 04-25-2013, 06:38 AM   #10
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Everyone has a personal preference with tire brands. I'd go with the Michelin LTX M/S2.

Rusty[/QUOTE]

I prefer the Michelins. I've run LTX M/S, but the new-used TV came with Michelin A/S and they really do a great job too. Good luck with your decision.
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Old 04-25-2013, 03:47 PM   #11
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I havent looked at the charts but if they have a 70 side wall instead of a 75, that may get you closer to the same revs per mile. i think i would just stick to the stock size though.
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Old 04-25-2013, 09:13 PM   #12
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Just a point on tire size selection.
Not sure what width your truck has but GM has used a 6.5" wide wheels for the LT245/75-16 E tire.

The LT265/75-16 E has a 7.5" wide tread requiring a 7.5" 8" wide wheel. Mounting a tire with a 7.5" wide tread on a narrow 6.5" wide wheel will balloon the tires tread causing the center to wear faster and may cause handling issues. Now if your truck has the optional 7.5" wide aluminum wheels then your good to go.
I tried the LT265 on my last GM 3/4 ton truck with stock 6.5" wide steel wheels. The truck was all over the road. so back to the tire dealer for another set of OEM LT245 tires.

The 245 at 60 mph = 2700 rpm in drive or 1:1.
The 265 at 60 mph = 2600 rpm in drive.

Not much rpm drop but with the 265 tire but a taller and heavier tire (parasitic drag) can be a hp killer on a small block gas engine.
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Old 04-25-2013, 10:25 PM   #13
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Teparr,

Here's a tire comparison tool I used when we went to a different tire size with all 6 tires on our MOHO.

245/75-R16 vs 265/75-R16 Tire Comparison - Tire Size Calculator

Hope you find it useful.
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