I recently purchased an SRM Pro after riding with a PT for the last year and a half. I did several rides with both powermeters together and the SRM is reading about 20% lower than the PT. I have decided to perform a static calibration of the SRM but have several questions.
1. I obtained a known weight of 20kg. Is this a sufficient amount of weight? I have read different descriptions of how much weight to use and am confused. Generally, I read more is better so just wondering if I should get another 20kg or if what I have is sufficient?
2. In the calculation formula obtained from SRM's website, it says to "take the average of all 6 zero-torque offset readings, and use in the calculations as the zero torque offset for both sides." Is this the average of the readings obtained with weight or am I to record the zero offset between each reading and average those (i.e. average the zero offset without weight)?
3. What is the proper gearing to use during the calibration? (i.e. 53 x 11 or 39 x 21, etc...) Is it necessary or beneficial to record the load test using different gearing? If so, do you take the average (assuming different readings)?
Any help you can provide would be appreciated. Thanks.
1. I obtained a known weight of 20kg. Is this a sufficient amount of weight? I have read different descriptions of how much weight to use and am confused. Generally, I read more is better so just wondering if I should get another 20kg or if what I have is sufficient?
2. In the calculation formula obtained from SRM's website, it says to "take the average of all 6 zero-torque offset readings, and use in the calculations as the zero torque offset for both sides." Is this the average of the readings obtained with weight or am I to record the zero offset between each reading and average those (i.e. average the zero offset without weight)?
3. What is the proper gearing to use during the calibration? (i.e. 53 x 11 or 39 x 21, etc...) Is it necessary or beneficial to record the load test using different gearing? If so, do you take the average (assuming different readings)?
Any help you can provide would be appreciated. Thanks.