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I just got 235/45R18 tires put on my TLX. How do I make my speedometer accurate at this point.
 

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2018 Acura TLX 2.4L Tech pkg
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What size did you change from? If only 1-2 size change then it shouldn't throw your speed accuracy off enough to matter.
 

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Online tire and wheel size calculators will tell you how far your speedometer is off. It appears you’re off by about 2% which is fine. For example when your speedometer is reading 60 mph you’re actually doing 61.2 mph.

There’s no adjustment that I’m aware of that you could do to the speedometer.
 
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