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Speed-o off??

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Old 08-31-2008, 01:23 PM   #2
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Not so much the lift but the larger wheels and tires, yes. Usually, though, the speedo is under by 3+ mph. Mine was reading 57 at 60mph and with the 265/75/16's I have now it's dead on. Mine has been verified via GPS and police radar (buddy is a cop).
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Old 08-31-2008, 03:02 PM   #3
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Stock was 265/65-17. Now their 265/70-17. Speedo was +3mph.Now it's +1mph.Per my scan guage.
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Old 08-31-2008, 04:18 PM   #4
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I went up a tire size and now my speedo is exactly the same as my GPS.
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Old 08-31-2008, 05:38 PM   #6
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Quote:
Originally Posted by longbow View Post
I am running 285's so I don't know if this would matter. If I am running 65 on the speed-o, GPS states 69.
I will have to get a couple of readings of a few pace cars to see what it really is.
Yeah my 09 tacoma shows 60 when my GPS shows 57... I was hoping I was opposite so when I do get bigger tires, it will even out. But I posted the exact same thread and was told (and tested it too) that the ODO is dead on, and I can say with accuracy (at least from my GPS) that this is true. Hope that helps.

Rob
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Old 08-31-2008, 06:33 PM   #7
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My 09 is about 2-3 mph off as well....shows 75-76 and scan gauge and GPS show 72-73 today on my trip. I figure when I replace tires I will go with 265's and even it out but thats down the road a bit.
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Old 08-31-2008, 07:50 PM   #8
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Anyone using a speedo correction when going with bigger tires?
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Old 08-31-2008, 07:53 PM   #9
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Quote:
Originally Posted by zero niner View Post
Anyone using a speedo correction when going with bigger tires?
Im calculating a 3.3% error (according to my GPS). Uh, you probably meant a signal corection device. my bad.
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Old 08-31-2008, 07:57 PM   #10
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Friend of mine did it for his ford. He went from 33's to 44's so I think he was 12mph off or something. The shop charged like $30 or something. It wasn't that bad considering the speeding ticket he got the day before for doing 85 in a 55 was like $120. He thought he was going 71
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