Changing tire size

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CarGuru > 4 x 4 > Changing tire size 8 April 2005 15:11:15

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Changing tire size
D745 25 March 2005 17:42:41
	Hi Will changing tire diameter to a larger diameter on my pickup truck help improve gas mileage?
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Mike Romain 25 March 2005 18:22:41 [ permanent link ]
	Yes, no, maybe. Your 'perceived' mileage will go down because of the increase in diameter, but the actual mileage might go up depending on your gearing. I went up 2" and my mileage stayed almost exactly the same 'if' I forget I have a 5th gear or overdrive. If I use overdrive, my rpm are too low so the engine lugs and just drinks gas. If I stay in 4th, my mileage stays virtually the same as before which is a respectable 23 US mpg in my CJ7. If my gearing had of been slightly different or if I re-geared, my 5th might still be useful and my mileage might have gone up but... The manufacturers seem to match tires and gearing to get the best mileage and power. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's d745 wrote:> Will changing tire diameter to a larger diameter on my pickup truck help> improve gas mileage?
		Add comment


Peter D . Hipson 25 March 2005 18:30:24 [ permanent link ]
	Probably not. Of controllable factors, driving habits affect mileage most. The difference in driving hard and easy can be as much as 20% change in mileage. I teach people to drive conservatively by suggesting that they drive with the mental image of a crock of $hit on the front seat beside them, and they don't want to spill it. No sudden acceleration, no excessive speed, no hard braking. It works. I had a friend who was a professional trucker. He was not slow, got places as fast, or faster than most others. He could set a cup of coffee on the dash (not in the holder!) and drive without spilling a drop--he was that smooth. Showed in his mileage... On Fri, 25 Mar 2005 08:42:41 -0500, "d745" <davel745@yahoo.com> wrote: Will changing tire diameter to a larger diameter on my pickup truck help>improve gas mileage?>
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Jack Daynes 25 March 2005 21:07:29 [ permanent link ]
	Mike Romain wrote:> Yes, no, maybe.> Your 'perceived' mileage will go down because of the increase in> diameter, but the actual mileage might go up depending on your gearing.> I went up 2" and my mileage stayed almost exactly the same 'if' I forget> I have a 5th gear or overdrive. If I use overdrive, my rpm are too low> so the engine lugs and just drinks gas. If I stay in 4th, my mileage> stays virtually the same as before which is a respectable 23 US mpg in> my CJ7.> If my gearing had of been slightly different or if I re-geared, my 5th> might still be useful and my mileage might have gone up but... The> manufacturers seem to match tires and gearing to get the best mileage> and power.> Mike> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00> 88 Cherokee 235 BFG AT's> d745 wrote:> Will changing tire diameter to a larger diameter on my pickup truck help>>improve gas mileage? Mike makes some good points about gearing. Another factor to consider is the with bigger tires, comes more height. You will catch more air and the resistance will have some effect on fuel consumption as well. -- -- Jack -- ================================= Everything you see is temporary. ================================= Clean Up Return Address To Reply ================================= Poway, California (San Diego Co.) N 32В° 57' W 117В° 04' At 508' Elevation =================================
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Bowgus 26 March 2005 01:00:56 [ permanent link ]
	No but ... "The U.S. Department of Transportation says that most drivers can improve fuel mileage by at least two percent by keeping their vehicle tires at the maximum recommended pressures. You can find the carmaker's recommended tire pressures in your owner's manual and on a tire decal or placard in the glove compartment or on the driver's door post, near a hinge." Note that this is not the max printed on the tire itself. "d745" <davel745@yahoo.com> wrote in message news:3824820e96b6155ca3a79b772c36794e@localhost.talkaboutautos.com...> Hi> Will changing tire diameter to a larger diameter on my pickup truck help> improve gas mileage?>
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Bowgus 26 March 2005 01:08:26 [ permanent link ]
	And in looking that up, I also read that a difference of 1/4 diameter between tires on a 4WD/AWD vehicle ... you know the ones I mean, the ones with the old (leaky) alloy rims, with at least one tire almost running on the rim ... can cause damage to the transfer case/drivetrain. "bowgus" <bowgus@rogers.com> wrote in message news:_pCdndk6Q7OO4dnfRVn-qQ@rogers.com...> No but ... "The U.S. Department of Transportation says that most drivers improve fuel mileage by at least two percent by keeping their vehicle tires> at the maximum recommended pressures. You can find the carmaker's> recommended tire pressures in your owner's manual and on a tire decal or> placard in the glove compartment or on the driver's door post, near a> hinge." Note that this is not the max printed on the tire itself.> "d745" <davel745@yahoo.com> wrote in message> news:3824820e96b6155ca3a79b772c36794e@localhost.talkaboutautos.com...> > Hi> > Will changing tire diameter to a larger diameter on my pickup truck help> > improve gas mileage?> >
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Bowgus 26 March 2005 02:06:22 [ permanent link ]
	1/4 = 1/4"
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Matt Mead 26 March 2005 02:22:18 [ permanent link ]
	On Fri, 25 Mar 2005 16:00:56 -0500, "bowgus" <bowgus@rogers.com> wrote: Will changing tire diameter to a larger diameter on my pickup truck help>> improve gas mileage?>> Maybe. Going to a larger diameter will change your overall effective gear ratio, causing your engine to spin at a slower RPM for a given speed. But, the larger diameter tire will be heavier, might be wider, and will change the airflow characteristics of the vehicle. This will offset some or all of any increase. (Might take away more than it gives, thus causing worse mileage.) I went from 265/75R-16s to 285/75R-16s and thought I might pick up a slight mileage increase since I'm running low 4.3 gears. Didn't work, and mileage actually slipped a bit. (My reasoning was that my dad's truck is same but with 3.73 gears and he always gets 1-3 mpg better.) Matt 99 V-10 Super Duty, Super Cab 4x4
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Peter D . Hipson 26 March 2005 04:10:20 [ permanent link ]
	Inflated to maximum pressure does not affect tire diameter. Period. What it does is reduce the contact patch, sidewall friction and flexing which do affect mileage. On Fri, 25 Mar 2005 16:00:56 -0500, "bowgus" <bowgus@rogers.com> wrote: No but ... "The U.S. Department of Transportation says that most drivers can>improve fuel mileage by at least two percent by keeping their vehicle tires>at the maximum recommended pressures. You can find the carmaker's>recommended tire pressures in your owner's manual and on a tire decal or>placard in the glove compartment or on the driver's door post, near a>hinge." Note that this is not the max printed on the tire itself.> "d745" <davel745@yahoo.com> wrote in message>news:3824820e96b6155ca3a79b772c36794e@localhost.talkaboutautos.com...>> Hi>> Will changing tire diameter to a larger diameter on my pickup truck help>> improve gas mileage?>>
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Bowgus 27 March 2005 01:58:22 [ permanent link ]
	Maybe you're thinking circumference ... the diameter of a flat tire for example, would be close to the diameter of the rim "Peter D. Hipson" <phipson@deletethisword.darkstar.mv.com> wrote in message news:61a94151i423csegq7ind5nihpvvi9p5ju@4ax.com... Inflated to maximum pressure does not affect tire diameter.
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Bowgus 27 March 2005 02:06:36 [ permanent link ]
	Just joking around Peter "bowgus" <bowgus@rogers.com> wrote in message news:XeydnVC07quURtjfRVn-2w@rogers.com...> Maybe you're thinking circumference ... the diameter of a flat tire for> example, would be close to the diameter of the rim > "Peter D. Hipson" <phipson@deletethisword.darkstar.mv.com> wrote in message> news:61a94151i423csegq7ind5nihpvvi9p5ju@4ax.com...> Inflated to maximum pressure does not affect tire diameter.>
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Franko 27 March 2005 04:21:52 [ permanent link ]
	Even if the tire is flat, the circumference (points of contact with road surface) stays the same unless the rim spins inside the tire. "bowgus" <bowgus@rogers.com> wrote in message news:XeydnVC07quURtjfRVn-2w@rogers.com...> Maybe you're thinking circumference ... the diameter of a flat tire for> example, would be close to the diameter of the rim > "Peter D. Hipson" <phipson@deletethisword.darkstar.mv.com> wrote in message> news:61a94151i423csegq7ind5nihpvvi9p5ju@4ax.com...> Inflated to maximum pressure does not affect tire diameter.>
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Peter D . Hipson 27 March 2005 18:11:44 [ permanent link ]
	Well, at best we are both right, but the term diameter requires a circle which a tire is not... <g> I should have said cirumference, but when I do that more people misunderstand than when I say diameter. It is so easy to think of a tire as round--that makes life easy. But, tires are never round, and the math of tire deformage is quite complex when the tire is under load. The math and theory of sidewall flex is very interesting, to say the least. (When I got my master's I interned at a Goodyear tire factory--one heck of an eye opening experience: did you know a typical radial tire has almost 100 seperate parts? Or that there are about eight different rubber compounds used in tire manufacturer? That the maximum safe temperature of a tire is just below the temperature that the tire was vulcanized at? There's nothign that says that tires have to be black? (in the beginning they thought it looked good, natural rubber color is dirty looking...) The main point is that letting air out of the tire won't change the number of revolutions that the tire makes to go a mile (which I think you and I agree on!) despite what one semi-popular 4x4 magazine said a year or so ago. If you put on a smaller spare, letting air out of the opposite tire on the axel won't balance things out--it just makes things worse! On Sat, 26 Mar 2005 16:58:22 -0500, "bowgus" <bowgus@rogers.com> wrote: Maybe you're thinking circumference ... the diameter of a flat tire for>example, would be close to the diameter of the rim > "Peter D. Hipson" <phipson@deletethisword.darkstar.mv.com> wrote in message>news:61a94151i423csegq7ind5nihpvvi9p5ju@4ax.com...> Inflated to maximum pressure does not affect tire diameter.>
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Erickr 28 March 2005 04:33:49 [ permanent link ]
	Hey fellas I have a 98 Ranger 4x4 that came with 235/70/16 tires. I have a chance to pick up 4 new 245/75/16 for a really good price. Will these tire work on my Ranger? I would like to know before I purchase them and find out they won’t fit. Thanks, Erick -- Posted using the http://www.autoforumz.com interface, at author's request Articles individually checked for conformance to usenet standards Topic URL: http://www.autoforumz.com/4X4-Changing-tire-size-ftopict109543.html Visit Topic URL to contact author (reg. req'd). Report abuse: http://www.autoforumz.com/eform.php?p=512798
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RubiconBoy 28 March 2005 09:51:25 [ permanent link ]
	"erickr" wrote: > Hey fellas I have a 98 Ranger 4x4 that came with 235/70/16 > tires. I have a chance to pick up 4 new 245/75/16 for a really > good price. Will these tire work on my Ranger? I would like to > know before I purchase them and find out they won't fit. > Thanks, > Erick Is your rig lifted or stock?? cause the tires your talking about are like an inch and a half taller and about half inch wider!
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D745 8 April 2005 15:11:15 [ permanent link ]
	Here is an interesting web site I just found http://www.tirerack.com/tires/tiretech/lighttruck/trukform.jsp These formulas have helped me in the decision to get a larger tire.
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CarGuru > 4 x 4 > Changing tire size 8 April 2005 15:11:15

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Changing tire size

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