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09-18-2018, 11:52 PM
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Join Date: Oct 2014
Location: West Kelowna B.C.
Posts: 410
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Which size tire
Bought a 2003 gmc 2500 HD used and now tires have had it, they call for 245/75/16 but owner put 265/75/16 on it, should I go back to stock size or go with the size he put on?
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09-19-2018, 12:01 AM
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Join Date: Aug 2007
Location: Calgary
Posts: 19,420
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Unless you have a need for the wider footprint & slight diameter increase then the stock size is probably best. Your speedometer will also be accurate again. Wider is better for soft terrain/ mud but worse for snow and ice, which do you realistically encounter more of?
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"The trouble with people idiot-proofing things, is the resulting evolution of the idiot." Me
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09-19-2018, 06:20 AM
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Join Date: Sep 2012
Posts: 6,271
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Bigger the tires, less $$$ in your wallet!
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09-19-2018, 07:43 AM
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AO Sponsor
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Join Date: Jun 2013
Location: Airdrie, AB and Part Time BC
Posts: 3,019
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Both are common to see on those trucks. If you like the look and little bit of extra height the 265's do work fine but as mentioned above, narrower is a little better in deeper snow etc and with the factory size all your calibrations for speed, mileage etc are more accurate. Tires costs are a little bit cheaper in the OEM size as well although there isn't huge differences between them. Really depends on what you like better. I found going bigger to be more of a trade off for day to day driving than it was worth, but if you use your truck in ways the bigger is more helpful or simply more aesthetically appealing then it isn't enough of a jump to cause anything catastrophic to the usability.
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09-19-2018, 08:24 AM
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Join Date: Aug 2008
Location: CNP
Posts: 3,760
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The 265 size tire should give you a small increase in fuel milage but a small decrease in torque.
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09-19-2018, 08:37 AM
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Join Date: Aug 2007
Location: Calgary
Posts: 19,420
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Quote:
Originally Posted by lannie
The 265 size tire should give you a small increase in fuel milage but a small decrease in torque.
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Not really for the fuel mileage, though it is slightly taller and you'll travel slightly further per revolution that also comes with some physics trade-offs, one being that it will weigh more and take more energy to spin up, second is that the additional width has to displace a greater amount of air out of its way, this too takes energy. Lastly there is rolling resistance, more contact patch means greater rolling resistance. You’re correct about the ever so slight torque decrease though. Then with the added weight and additional diameter come negative hits to braking performance. With tires, absolutely everything is a physics trade-off. Note that anytime you see a vehicle designed to set fuel economy records, they invariably have super-narrow tires, almost like a long distance road racing bicycle (itself another example of tires selected for a purpose).
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"The trouble with people idiot-proofing things, is the resulting evolution of the idiot." Me
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09-19-2018, 09:25 AM
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Join Date: Feb 2011
Posts: 1,034
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Quote:
Originally Posted by partsman
Bought a 2003 gmc 2500 HD used and now tires have had it, they call for 245/75/16 but owner put 265/75/16 on it, should I go back to stock size or go with the size he put on?
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I owned half a dozen of these trucks that came with the 245's, first thing I did was put 265's on. They are only .75" wider & an 1" taller. You will not notice any difference in anything that is measurable, & you will have a tire with a larger load limit.
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09-19-2018, 10:00 AM
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Join Date: Oct 2015
Posts: 304
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I went the other way, to 235/85 10 ply Hankooks. Much better all-season traction and a bit more clearance. I run them harder too, at 55 psi. (They're good for 90 pounds.) Having the computer reset to the tire size is a 2 minute effort at your favourite dealer. It's also the only way I could ever improve the mileage out of a 6 litre with slow diffs.
I always have the feeling that wide tires reduce the ground pressure too much (per square inch) and feel slippery.
One thing I can say for sure, I'l never again buy anything less than a 10 ply tire!
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09-19-2018, 10:17 AM
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Join Date: Aug 2007
Location: Calgary
Posts: 19,420
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Quote:
Originally Posted by Oldan Grumpi
I went the other way, to 235/85 10 ply Hankooks. Much better all-season traction and a bit more clearance. I run them harder too, at 55 psi. (They're good for 90 pounds.) Having the computer reset to the tire size is a 2 minute effort at your favourite dealer. It's also the only way I could ever improve the mileage out of a 6 litre with slow diffs.
I always have the feeling that wide tires reduce the ground pressure too much (per square inch) and feel slippery.
One thing I can say for sure, I'l never again buy anything less than a 10 ply tire!
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I also like a tall & narrow tire for winter, I wish there were some more options as I have a new vehicle that I'd like a slightly taller tire for but my dually rears and the lack of aftermarket wheel options (Mercedes Sprinter) make for very few available size choices. I'd like a 95 or 100 series sidewall option!
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"The trouble with people idiot-proofing things, is the resulting evolution of the idiot." Me
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09-19-2018, 11:12 AM
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Join Date: Dec 2008
Location: Near Edmonton
Posts: 15,061
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Another vote for the 235/85/16 tires. 1" taller than stock, lower rpm at same road speed, more clearance with no modifications needed, fit on stock rim, better traction on ice and snow and less rolling resistance. Unless you go to REALLY wide tires you are not going to make a modern pickup float in sandy or swampy country. You need a light rig and at least 25" balloon type or Agricultural tires to get any flotation.
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09-19-2018, 04:56 PM
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Join Date: May 2007
Posts: 3,171
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IMO, stay with the 265's for a bit more height.
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09-20-2018, 12:50 PM
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Join Date: Oct 2007
Posts: 714
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Quote:
Originally Posted by gmcmax05
i owned half a dozen of these trucks that came with the 245's, first thing i did was put 265's on. They are only .75" wider & an 1" taller. You will not notice any difference in anything that is measurable, & you will have a tire with a larger load limit.
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exactly
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09-19-2018, 09:50 PM
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Join Date: Nov 2014
Posts: 53
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235/85-16 Better mileage, better winter traction and cheaper. I have changed to these on work and play vehicles for the past 20 years.
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