for those of you who are using the Polar Power unit, what values did you enter for your chain length and weight -- the ones recommended by Polar (for the common chains listed in the Power handbook) ? or did you take time to measure and weigh your own chain?
the recommendations for a Campagnolo Record chain are 1,448 mm x 279 grams. however, prior to replacing my chain (with another Record chain), i measured it and the correct chain length was 1,353. i went ahead and changed the length value for the chain.
then i took my chain to a post office and weighed it. i was surprised to find that it weighed 1.569 lbs, or 712 grams. this is more that twice the MFG's estimated weight.
i haven't changed the chain weight yet, but will probably do so and do a few test rides on a predetermined course -- 1 with the old values (1,448 x 279), 1 with the new length and old weight (1,353 x 279), then a final one with all new values (1,353 x 712). i can then compare the results to see if there is any difference in the power output value.
anyone else who has worked through this? i'm wondering whether the change in values are material enough to alter the complex power calculation used by the Polar. i found the formula on a website, and there were tons of square roots going on..........
the recommendations for a Campagnolo Record chain are 1,448 mm x 279 grams. however, prior to replacing my chain (with another Record chain), i measured it and the correct chain length was 1,353. i went ahead and changed the length value for the chain.
then i took my chain to a post office and weighed it. i was surprised to find that it weighed 1.569 lbs, or 712 grams. this is more that twice the MFG's estimated weight.
i haven't changed the chain weight yet, but will probably do so and do a few test rides on a predetermined course -- 1 with the old values (1,448 x 279), 1 with the new length and old weight (1,353 x 279), then a final one with all new values (1,353 x 712). i can then compare the results to see if there is any difference in the power output value.
anyone else who has worked through this? i'm wondering whether the change in values are material enough to alter the complex power calculation used by the Polar. i found the formula on a website, and there were tons of square roots going on..........