ABSTRACT GARDNER, AS, S. STEPHENS, DT MARTIN, E. LAWTON, H. LEE, and D.
JENKINS. Accuracy of SRM and Power Tap Power Monitoring Systems for Bicycling. Med.
Sci. Sports Exerc., Vol. 36, No. 7, pp. 1252–1258, 2004. Purpose: Although manufacturers of
bicycle power monitoring devices SRM and Power Tap (PT) claim accuracy to within 2.5%,
there are limited scientific data available in support. The purpose of this investigation was to
assess the accuracy of SRM and PT under different conditions. Methods: First, 19 SRM were …

PURPOSE: Although manufacturers of bicycle power monitoring devices SRM and Power
Tap (PT) claim accuracy to within 2.5%, there are limited scientific data available in support.
The purpose of this investigation was to assess the accuracy of SRM and PT under different
conditions. METHODS: First, 19 SRM were calibrated, raced for 11 months, and retested
using a dynamic CALRIG (50-1000 W at 100 rpm). Second, using the same procedure, five
PT were repeat tested on alternate days. Third, the most accurate SRM and PT were tested …