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Old 07-28-2014, 06:33 AM
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Davezilla Davezilla is offline
Motorized Bicycle Elite Member
Join Date: Mar 2014
Location: San Antonio Texas
Posts: 2,710
Default Re: Setting computer

Yup... outside circumference... Most instructions say to make a chalk mark on the tire at the 6 o'clock position and a mark on the ground or sidewalk, then roll the bike one full turn of the wheels so the chalk mark is at the 6 o'clock position again and make another mark on the ground, then measure the distance between the 2 marks on the ground. This is an accurate way to get the circumference, but you can also measure the total diameter of the tire and multiply by pi ... or 3.14
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