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Old 01-20-10, 07:28 PM   #1
Tcchap
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Calibrate Polar HRM/Cycle Computer

Just got a Polar CS 200 HRM for Christmas and I love it. But...I have noticed that there may be something wrong with the calibration for the cycle computer. It seems to be about 1/10 of a mile off for each mile. I have a route leaving from my house that I have measured many times with both of my cars and my old $10 walmart/schwinn cycle computer. The first ride I took with it is a 10 mile out and 10 mile back and it came up short on the mileage. I have 700 x 23 tires and I entered the correct code...just wondering if anyone else has come up against this with Polar. Thanks.
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Old 01-21-10, 12:39 PM   #2
Giro
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Three ways, each with greater accuracy than the preceeding one.

Sheldon Brown's site (may he rest in peace) knows all, tells all:

Deriving tire diameter from ISO/ETRTO numbers
Roll-out Test for Super Accuracy
Using a measured course to fine-tune your setting

I've used the measued course method, determining the distance beginning of intersection to beginning of intersection, from Google Maps. When my 3 mile commute goes off by 0.02 miles, I know its time to pump up the tires. I suggest going directly to the measured course method, the longer and straighter, the better.
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Old 01-21-10, 08:12 PM   #3
Tcchap
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Thanks, looking on Sheldon's site, I did have another number for my wheels than he had in his charts. I set it and can't wait to try it this weekend.
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Old 01-23-10, 04:13 PM   #4
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Just tried it out and it seems to be right on. There has to be something wrong with my mph though I know I was riding. Thanks again.
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Old 01-27-10, 04:37 PM   #5
darrylcycle87
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arent they great? Im using a cs600X and all I got to say is wow.
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