Bicycle Mechanics - Polar S510 monitor and computer probs

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TBeri

05-17-03, 07:14 PM

Does anyone have/use one of these? I received it as a gift last week. Tried it this morning after setting it up, only to have really screwed up distances and speed recorded. The mm tire circumference I plugged in was 2215. I've got 700 x 40c tires. The circumference for these is not listed in the booklet with the monitor, but estimated from the booklet with my husband's cycle-computer (I don't know what type he has). Anyway, this is probably smaller than my true wheel circumference, and thus would not account for the adding of 10 plus miles in distance and way-overestimating my speed by about 10mph at one point.
Any help appreciated.
TBeri

Rev.Chuck

05-17-03, 07:22 PM

Roll out your wheel. Mark a start point on the floor, line up the valve stem and roll it out til the valve stem comes to bottom again. Make another mark and measure. If you only have inches to measure with multiply by twentyfivepointfour. This should be your number.