Originally Posted by
FBinNY
+1 you want the "roll out" which is the distance the wheel travels in one revolution. I've found the easiest way is to mark the tire with something which will transfer, like chalk, or slow drying paint or ink. Then ride the bike making marks on the pavement as you go along. Now you can measure the distance between the marks for an accurate roll out calculation.
BTW- if your mark lasts long enough to make 3 or 4 dots on the road, measure over the maximum distance, and divide by the number for a slightly more (far more than you need) accuracy.
Marking the tyre with oil or something is great outdoors, less great if you live in an apartment and don't want sticky marks on the kitchen floor
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