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bmxpimp said:
does anyone know the number to set for 650b or 27.5 with 2.3 tires?
Or mark the top of the tire with something that will transfer to the ground....like a dab of peanut butter or something..Roll the bike far enough (in a straight line) that you have two marks on the ground, and measure that distance.
CDT
 

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To get accurate roll out, be sure you are sitting on the bike with the tire pressure you like when measuring, then start with the valve stem at 6 o'clock and put a piece of tape on the ground and mark an arrow with a sharpie where the stem is. Next, roll one rotation then have a friend put down another piece of tape and draw another arrow when the valve stem is at 6 o'clock again. Measure between those points and put that number in your computer. You will be off by 8cms or so if you push the bike only. I lost this argument to a friend.:D Body weight squishes the tires to a different circumference.
 
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