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Ther's no factory proceedure for recalibrating the speedometer to cater for different size tyres.
It's possible a number of companies make devices that can be retro-fitted to the vehicle that can "alter" the speedometer reading.
Given that the standard speedometer is almost certainly reading 10% high, fitting either of the alternative tyre sizes quoted by you will actually make your speedometer more accurate.
The tyres quoted will cause your speedometer to read just under 5% low compared to standard tyre sizes which means you speedometer would only in future read approx 5% low rather than the 10% previously.
Nothing to worry about in my opinion. 
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1st Apr 2013 8:19am
