On Christmas Eve I had two children on the bike, one on either carrier rack, each child is about 25kg. We did a few laps of two tennis courts, no problems. The front rack is more easily wobbled from side to side.
Late Christmas Day I measured the circumference of the tyre, or to be exact, I measured the ground covered when the wheel passes through one revolution. I applied some weight to the handlebars and took the front wheel, valve stem down-most, from a line on some concrete until the valve stem was again at the bottom, repeated several times. I measured 1725mm, let's call it 172cm. Without weight on the handlebars it goes two or three cm further.
Calculating circumference = 22inches * 2.54 * 3.14 = 175.5cm
or using 22.2 inches (see earlier post), gives 177cm.
I will use 172cm for the cateye computer.
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