Power meters · Public discussion

force, torque, etc.

Started by postal_bag · · Last activity · 2 posts · 1,526 views

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Power meters
Published
8 November 2008
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8 November 2008
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postal_bag
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  1. I've been trying to understand something about my Cycleops Pro 300PT. I can switch the power display to show hub torque, measured in inch-lbs.

    When I review a ride on Cycling Peaks, there is a huge difference between the recorded hub torque and what was showing during the ride.

    For example, if I ride at 360 w with a cadence of 90 rpm, the display will read 90-100 inch-lbs, but when I view the file afterwards, Cycling Peaks will show 10.3 lb-in for the same effort.

    Are "inch-lbs" different from "lb-in"? Is the display simply lacking a decimal point, which would make the difference significantly less?

    So how is this ~100 inch-lbs actually calculated (using the 360 w, 90 rpm example if possible)?

  2. postal_bag said:

    I've been trying to understand something about my Cycleops Pro 300PT. I can switch the power display to show hub torque, measured in inch-lbs.

    When I review a ride on Cycling Peaks, there is a huge difference between the recorded hub torque and what was showing during the ride.

    For example, if I ride at 360 w with a cadence of 90 rpm, the display will read 90-100 inch-lbs, but when I view the file afterwards, Cycling Peaks will show 10.3 lb-in for the same effort.

    Are "inch-lbs" different from "lb-in"? Is the display simply lacking a decimal point, which would make the difference significantly less?

    So how is this ~100 inch-lbs actually calculated (using the 360 w, 90 rpm example if possible)?


    Think I figured it out. Cycling Peaks seems to be displaying hub torque in N-m even though it says lb-in.

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