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The Tire Rack's Tire & Wheel Forum
Use this forum to discuss anything in relation to wheels to tires to offsets.
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Old 05-19-2004, 12:01 PM   #1
andy 323i
 
Join Date: Dec 1969
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tires gps speed

Okay i just changed my tires from stock 255/65/16 to 245/70/16 on my pathy and with my new gps i took a road trip i was crusing at 75 according to the car speedometer but the gps said 72

when the gps said 75 mph the pathfinder said 80
which is more accurate ?
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Old 06-30-2004, 11:07 AM   #2
ejs325i
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Speed

Hey,
I notice a 3 miles difference on my car too. I am using the tires that came from factory.
I have a Garmin GPS.
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Old 06-30-2004, 12:02 PM   #3
teamdfl
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Quote:
Originally Posted by andy 323i
Okay i just changed my tires from stock 255/65/16 to 245/70/16 on my pathy and with my new gps i took a road trip i was crusing at 75 according to the car speedometer but the gps said 72

when the gps said 75 mph the pathfinder said 80
which is more accurate ?

Do people still actually drive overpriced POS trucks every day?


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Old 06-30-2004, 12:05 PM   #4
teamdfl
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255/65/16 is about 711 revs per mile
245/70/16 is about 706 revs per mile

That is less than a 1% difference.


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