Reply to "Difference between cal and course surface"

alanjonesMember

Jim, in 1976 I measured a cross-country course. I calibrated on our road course and then calibrated on a calibration course (800’ in length) on the grass. The calibration figures were: 15771.5 counts/mile on the road and 15614.8 counts/mile on grass. You can see I had more revolutions of the bike wheel on the road than I did on the grass. If I used the road calibration when measuring the XC course, I would have ended up with a short course. The difference is about 1.0%. I should mention that the calibration course was not level. It was not possible to find a level stretch. I recorded more counts on the uphill runs than the downhill. I think this is because my weight was forward on the uphill runs making the bike tire sink more into the turf.

I think you should calibrate and measure on the same type of surface.

Alan

10/20/1812:43 PM

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