Halfords Bicycle Computer, Owner'S Manual

Page: 9 / 32

9
How do you measure the wheel circumference
yourself?
Roll the wheel until the valve stem is closest to the ground and mark
the corresponding spot on the floor as the first point. Next, roll the
wheel forward until the valve stem is closest to the ground once again.
Mark the corresponding spot on the floor as the second point.
Then measure the distance between both points, using the unit of
millimeter. The distance equals your wheel circumference.
1. The default value of wheel circumference for Bike 1 is 2155mm;
that for Bike 2 is 2050mm. Enter the correct wheel
circumference into the computer in Data Setting Mode.
2. Refer to pages 10 and 11 about basic setting to set your wheel
circumference.