| Jude |
| Could having improperly balanced/inflated tire(s) affect your speedometer? |
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| mgthe3 |
They would have to be seriously underinflated; so much so you wouldn't be able to drive it.
Balance? I think not. |
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| njjoe |
Jude-
Out-of-balance tires would have no effect on the accuracy of your speedometer.
The rolling diameter of a properly inflated OEM goodyear tire is 30.0 inches. An under-inflated tire that had an outside diameter of 29.0 inches would affect the accuracy by 3.3%. An indicated 60.0 mph would actually be 58.0 mph.
-njjo |
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| Jude |
Gotcha. I dont really understand how you computed that nijoe (Im assuming its a little complicated lol) and I dont think I want to know :P
Reason why I asked was because I recently got a speeding ticket, and the cop says that I was going 80 and when I looked at my speedometer it read 75 and Im trying to think of every single way I could get out of this ticket cause I cant take traffic school, and I dont want my insurace to go up.
I did however read on the net somewhere that changing your rims/tires to a different size could greatly effect your speedometer. Anyone have any knowledge about this? |
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| njjoe |
quote:
Originally posted by Jude
I did however read on the net somewhere that changing your rims/tires to a different size could greatly effect your speedometer. Anyone have any knowledge about this?
Check out this link --> Tire Size Calculator
It will show how various non-stock tire sizes affect the accuracy of your speedometer.
If you are concerned about the accuracy of your speedometer I suggest you borrow a GPS and compare indicated speeds.
-njjoe |
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| Corin |
quote:
Originally posted by njjoe
If you are concerned about the accuracy of your speedometer I suggest you borrow a GPS and compare indicated speeds.
Agreed. Try this. Several people on this forum have "checked" their speedometer against GPS systems. If I remember correctly, it seems almost everyone had a pretty accurate speedometer (within 2% or so) but there were a couple that reported close to a 5% difference.
I assume you have stock tires, wheels, right? If you have LARGER diameter wheels than stock, then you would be going FASTER than your speedometer reports. If you have under inflated or smaller tires, then your actual speed would be SLOWER than what your speedometer tells you.
There are places where you can get your speedometer tested, but it's simpler to just ask your friends to see if anyone has a GPS system. |
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| Gonzo |
| Agree... my MO's speedo is very accurate. |
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| kartl |
That is true there will be no effect even though its been inflated to its last air, unless it was kept or ignored for a very long time, it might change its shape.
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Autopartswarehouse |
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