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Tacx trainer question(1 post)

Tacx trainer questionrollo tommassi
Feb 12, 2003 12:19 PM
I've got a Grand Excel....plus a Powertap on the rear.

The cadence and speed readings are matching up (within a point or two), but the wattage is way off.

The Tacx will read 84 wattage while the powertap computer will read 247.

Is there a fundamental difference in the way these two units measure, or is something not calibrated correctly?