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Recalibrating Speedo For Larger Tires

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Old Dec 7, 2020 | 10:38 AM
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2021 MB G63
Recalibrating Speedo For Larger Tires

Hello All,
I just received a 21 G63 and am getting a set of 463 Industries 20" set for winter in January when they are back in stock. I am thinking about getting larger more aggressive tires for the vehicle with that set. Is there anyway to recalibrate the speedometer for the larger size. I tried to search but couldnt find anything.
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Old Dec 7, 2020 | 12:05 PM
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Originally Posted by monzag63
Hello All,
I just received a 21 G63 and am getting a set of 463 Industries 20" set for winter in January when they are back in stock. I am thinking about getting larger more aggressive tires for the vehicle with that set. Is there anyway to recalibrate the speedometer for the larger size. I tried to search but couldnt find anything.
See if the dealer can handle the install. That would be the best approach IMO.
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Old Dec 8, 2020 | 04:26 AM
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Originally Posted by monzag63
Hello All,
I just received a 21 G63 and am getting a set of 463 Industries 20" set for winter in January when they are back in stock. I am thinking about getting larger more aggressive tires for the vehicle with that set. Is there anyway to recalibrate the speedometer for the larger size. I tried to search but couldnt find anything.
Are you saying that your winter and summer tire sets will have different diameters, and you plan to recal the speedo each time you flip them?
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Old Dec 8, 2020 | 06:56 PM
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Originally Posted by streborx
Are you saying that your winter and summer tire sets will have different diameters, and you plan to recal the speedo each time you flip them?
Maybe.
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Old Dec 8, 2020 | 07:15 PM
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Keep in mind that changing tire sizes also affects the odometer.
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Old Dec 8, 2020 | 09:33 PM
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Originally Posted by monzag63
Maybe.
Speedo recal should be possible with a MB SDS, but I would check with the dealer. Likely he'll want to be paid an hour's shop rate every time he does a 30 second recal. Or you can just live with the error. One inch increase in tire diameter is about 3% low in speed (65 mph will really be 67 mph), and 50K odometer miles will be 51.5K. Probably not enough to lose sleep or $$ over.
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Old Dec 8, 2020 | 10:13 PM
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Originally Posted by streborx
Speedo recal should be possible with a MB SDS, but I would check with the dealer. Likely he'll want to be paid an hour's shop rate every time he does a 30 second recal. Or you can just live with the error. One inch increase in tire diameter is about 3% low in speed (65 mph will really be 67 mph), and 50K odometer miles will be 51.5K. Probably not enough to lose sleep or $$ over.
I'd be more concerned about the odometer. IMO that can be a big difference. At this level you want it right. A few dollars at the dealer is nothing if you want to keep your G operating properly.
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