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Old 06-09-2013, 11:32 PM
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patricklee85 patricklee85 is offline
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Join Date: May 2013
Location: Minnesota
Age: 29
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Vehicle: 2009 Dodge Ram
Trim Level: SLT Big Horn
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Engine: 2009-20?? 345ci (5.7L) Hemi V8 390hp 407lb/ft
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Default Changing registered tire size with DS inTune

First off, I apologize if this isn't the right spot for this.

I have an 09 1500 that came with factory 20's. After leveling kit, I put 285/65/20's on factory rims. I just recently got the DS inTune and starting playing with it. I put the new tire size in but my speedometer is still off, but in the opposite direction. I tried using the metric size and also the standard equivalent.

Before Tune: 55mph on speedo = 58mph in reality
After Tune: 55mph on speedo = 52mph in reality

My "reality" is based on a HUD app on my iPhone. Did I do something wrong with the tuner? Has anyone else what this problem?
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