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| What calibration number should I use for a 650 x 23 c tire? | ||||||||
Or, to determine the most accurate calibration # for your application, or if your tire size is not listed in the chart, determine calibration # by performing a ‘tire roll out’. To do a tire roll out: 1. Mark a spot on the floor, and line up the tube’s valve stem with the mark. You’ll want to choose the wheel that the magnet is mounted on. 2. Running the usual tire pressure, and with the rider’s weight on the bike, roll the tire out one full revolution. When the valve stem comes back around to the ground, make a second mark on the floor. Measure the distance on the floor from mark to mark. Note: This is best performed parallel to a wall, to ensure the roll out is done in a straight line. 3. Record this number in cm if your computer requires a 3-digit calibration # (or multiply inches by 2.54 for cm). Or, record this number in mm if your computer requires a 4-digit calibration # (or multiply inches by 25.4 for mm). 4. Enter this number in your computer for your wheel circumference. |
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