[bmxpimp]

does anyone know the number to set for 650b or 27.5 with 2.3 tires?

 

[clearcreek]

pdfs of manuals are available at cateye.com. The number should be circumference of wheel and tire in cm. Use a metric seamstress' tape measure for actual measurement.

 

[CdaleTony]

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

 

[bamwa]

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. Body weight squishes the tires to a different circumference.

 

[Southgagnatknocker]

Godd thinking bamwa1....but now I have to go back and recalibrate my cateye.