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Measure the overall diameter or the circumference of your old tires and your new tires. The % change will be the same as the change in speedometer and odometer readings.
Make sure you have a decent amount of clearance (5mm+) for the brakes, as "things" can shift around somewhat when loaded or when parts get hot. It wouldn't be much fun to go around a corner and have your wheels start to machine your brake calipers away...
-soD
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