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This is a discussion on Tire Calibration/New Size within the Gen II Prius Care, Maintenance and Troubleshooting forums, part of the Gen II (2004-2009) Toyota Prius Forums category; After reading other posts, I have not found the answer to my question. Would someone please tell me if the ...


Tire Calibration/New Size

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Old 06-10-2008, 01:52 PM   #1
brighamwj
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Question Tire Calibration/New Size ?

After reading other posts, I have not found the answer to my question.

Would someone please tell me if the Calibration function will re-calibrate for a new size 195/60/15 tire (the increased rotations per mile) to show the correct speedo/odo and GPS location?

I want the tires for slightly better handling with more rubber on the road.

I don't want the extra miles on the odo or drive with speedo a speed slightly faster than I am traveling.

I don't know if there are wheel sensors that can measure the circumference travel and update the computer during re-calibration or if the calibration will only reset the 24.4 diameter of the stock 185/65/15 tires?

Thank you in advance for the information
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Old 06-10-2008, 02:40 PM   #2
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Default Re: Tire Calibration/New Size

The difference to the US standard 185 - 65h 15 is tiny so I don't believe you need to change anything. This (195 x 60 x 15 is the standard tyre size in markets outside North America except Europe where 16 inch wheels are standard.

Tire Size Comparison

Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
185/65-15 . . 4.7in . 12.2in . . 24.5in . . . .76.9in . . . . . 824 . . 0.0%
195/60-15 . . 4.6in . 12.1in . . 24.2in . . . .76.1in . . . . . 833 . -1.0%

Last edited by patsparks; 06-10-2008 at 02:45 PM.
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Old 06-10-2008, 03:18 PM   #3
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Default Re: Tire Calibration/New Size

Yeah I guess you are right. I am worried about putting 1000 extra miles on the odo over 100,000...that will be the day that I make tires last that long.

On another thread an owner states he has over 100k miles on his Michelin Hydroedges...Unbelievable.

Are your tires the 195/60-15 down in OZ?

I saw your mileage on another thread so I know that size won't cause a substantial hit to mpg/kpg.

Cheers.
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