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i just put 325/60r20's on my truck :becky: and was wondering how bad my speedometer is off. if you have any feedback let me know.
 

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I have 285/75/18's (34.8") and at 100 km/h on the speedo I am doing 112 GPS.
 

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2 mph at 55 per the radar gun speed sign on the side of the road
 

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whats funny is i went to 275/70/18 (which toyo specs as a 33.1) and according to my GPS, mine is exactly on the nose now....so i guess with the stock tires i was off a little then.....who knows. so i cant imagine going to a 35 being too far off....
 

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Whaddya know. There is a six character minimum post requirement.
 

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Im running 285/75/18s and my speedo is 100% accurate. Oh, guess thats cuz I have the hypertech speedo recalibrator. Its a well worth while $200 investment.
 
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