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  #1  
Old 12-13-2009, 10:28 AM
Dang Dang is offline
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Default Do I have this right?

If I have larger tires then stock tires on a car/truck....
the odometer will show I traveled a mile after I actually traveled a mile. Right?
And so....I am actually getting better gas mileage per mile then I thought. Right?
And if the speedometer reads 60mph....
am I actually going faster or slower then 60? I'm going faster, right?
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  #2  
Old 12-13-2009, 10:32 AM
Redneckstone Redneckstone is offline
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MPH shows slower. and your odometer runs slower you are getting worse mpg before converting your od
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Old 12-13-2009, 02:11 PM
DisturbedESV DisturbedESV is offline
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WTH?! When did Stone get here!? Shit....
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that's it, marie is pissed. game over
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  #4  
Old 12-13-2009, 02:26 PM
Jay FX4 Jay FX4 is offline
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Remember that a larger diameter tire takes longer too make one revolution. That means your speedo will be on the low side, and you'll be traveling further than what your odometer shows.
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Old 12-13-2009, 02:33 PM
West West is offline
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With larger tires, your speedometer is actually reading slower than you are actually going. So if your speedo says 60, you may actually be going 55. The amount that its slower depends on how much larger your tires are. Your odometer will also record less mileage too. As for getting better gas mileage, its all on how you drive and what type of driving you do. Your truck will feel a little slower off the line, but cruising down the highway your RPMs will actually decrease. I would imagine that if you are doing all highway driving, your mpgs will increase due to the lower engine speed. But if you are doing more city driving, it would decrease due to having the truck work harder o get up to speed. Again, it is all in how you drive it too.
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  #6  
Old 12-13-2009, 02:51 PM
DisturbedESV DisturbedESV is offline
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Quote:
Originally Posted by West View Post
With larger tires, your speedometer is actually reading slower than you are actually going. So if your speedo says 60, you may actually be going 55.
Um... I think you mean it if ready 60 you're really going about 67.....
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  #7  
Old 12-13-2009, 08:09 PM
West West is offline
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Quote:
Originally Posted by DisturbedESV View Post
Um... I think you mean it if ready 60 you're really going about 67.....
Yeh, I must have had a dumb moment. I knew that too, I just screwed it up. Sorry.
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  #8  
Old 12-14-2009, 01:52 AM
Dang Dang is offline
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Quote:
Originally Posted by Redneckstone View Post
MPH shows slower. and your odometer runs slower you are getting worse mpg before converting your od
Thank You
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  #9  
Old 12-14-2009, 08:51 AM
RoadDawg RoadDawg is offline
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These questions are why I posted the tire size calculator. If you open it up and type in your OEM tire size in the Stock size area and the new tire size below... It will give you ALL the information you are looking for... Including the difference in revolution of your tire sizes and the exact amount that your Speed/odometer are off.

Also, if you are running a smaller than stock size tire your speedometer will read FASTER than what your actual speed is and the odometer will rack up MORE miles than you actually traveled.

The exact opposite is true for Larger than stock size tires, Your speedometer will read LESS MPH than you are traveling and your odometer will register LESS miles than you have traveled.

The calculator gives you the exact computation for the data needed.

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