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  #1  
Old 07-09-2009, 09:22 PM
HUK HUK is offline
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Speeodometer readings and OEM wheel options

The sport package comes standard with 255/50-19s. The 20" wheel option (275F/315R) actually gives you a slightly smaller circumference, and the speedometer would then be off by 1.3% compared to the 19" setup.
Is there a factory setting / adjustment I can make to the odometer to compensate for the smaller circumference if I decided to upgrade the wheel package?
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Old 07-09-2009, 11:00 PM
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Quote:
Originally Posted by HUK View Post
The sport package comes standard with 255/50-19s. The 20" wheel option (275F/315R) actually gives you a slightly smaller circumference, and the speedometer would then be off by 1.3% compared to the 19" setup.
Is there a factory setting / adjustment I can make to the odometer to compensate for the smaller circumference if I decided to upgrade the wheel package?
No adjustment. 1.3% will not make a difference that you could notice. Given that the speed registered by the odometer is 5.0 KM/H slower than the actual speed. I tested this against my GPS and the speedometer is consistently 5 KM/H slower than what the GPS speed reading is when traveling above 25 km/H.
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Old 07-10-2009, 12:10 AM
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I would think Denalio is right. Probably not a significant difference worth worrying about.

Does anyone get speedometers recalibrated anymore?

By the way, how accurate are typical portable GPS speed readings?
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Old 07-10-2009, 07:33 AM
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use this tire calculator to see if you can find a spec closer to original. I agree 1% means nothing and you will never notice it...

Tire Size Calculator - tire & wheel plus sizing
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