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Old 06-28-2009, 10:23 AM
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Speedometer question

We went to a wedding last night that was out in the middle of nowhere. I put the gps in my truck and away we went. That was the first time I'd ever had the gps in my truck. Anyway, I would be running 60 mph going by the speedo and the gps said I was doing 64. I've got 35's on my truck but I didn't think it would throw it off that much. Does 4 mph off sound right with 35's
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Old 06-28-2009, 10:25 AM
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That sounds about right. My truck was off 2 mph with just 285/75R16s.
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Old 06-28-2009, 10:27 AM
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Quote:
Originally Posted by 03-blue-Powerstroke View Post
That sounds about right. My truck was off 2 mph with just 285/75R16s.
Really? I knew it would be off a little but I thought 4 mph seemed a little high. Guess I need to start watching my speed a little more
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Old 06-28-2009, 10:31 AM
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In Pa we have all of these message boards that tell you your speed. With the combanation of that and my dads gps I figured I was about 2 mph off.
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Old 06-28-2009, 10:32 AM
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mine is 2mph off with 235/85/16's
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Old 06-28-2009, 10:49 AM
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mine is way off. although remeber the faster you go the more the speedo will be off.
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Old 06-28-2009, 11:18 AM
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Should be about 10% off or thereabouts with 35's
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Old 06-28-2009, 11:18 AM
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Quote:
Originally Posted by cliford View Post
mine is way off. although remeber the faster you go the more the speedo will be off.
+1

With 35's my speedo was pretty accurate until around 40mph, by the time I hit 60 it was off by 5mph
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Old 06-28-2009, 01:26 PM
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Quote:
Originally Posted by BadAss01F250 View Post
+1

With 35's my speedo was pretty accurate until around 40mph, by the time I hit 60 it was off by 5mph
I didn't think about it being farther off the faster you go. I'll have to keep the gps in there for a few days so I can see how much it's off at what speed so I don't get a ticket
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Old 06-28-2009, 01:27 PM
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Quote:
Originally Posted by ianstew View Post
mine is 2mph off with 235/85/16's
thats a stock size and its still off?

im running 265/75/16
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