Then do a few three to five minute efforts at varying power levels across your primary range of interest for instance maybe 200 watts, 250 watts and 300 watts or something like that. Basically you just get a really good warmup for your CT, do the roll down calibration and make sure theh press on force comes in around 2 to 2.5 or so, readjust the tire press on force knob if your much outside of that range and make sure you get consistent roll down values (which BTW are in units of pounds of press on force). I learned to take the CT power readings with a large grain of salt and to trust my PM for workout intensity.Īnyway, they do seem to vary a lot but if you don't mind voiding the warranty on your CT you can adjust the slope to get a better match to your SRM readings. Even when I used the same numbered CT unit week after week I'd see variation relative to my PM. I learned quickly to try to get the same trainer for each session as the individual units were all over the map in terms of some reading high relative to my torque tested and zeroed PM and some reading quite low even after a solid 20 minute warmup and CT coast down calibration. I trained last winter at an indoor cycling center equipped with Computrainers. Unless I dedicate a fan to cool the CT braking unit the two power readings start to drift after about half an hour to forty minutes of sustaining 250-280 watts. I swapped to SRM cranks about a year ago and other than the slight power offset due to drive train losses my power readings are very close at least they start that way after 10 minutes of warmup and the coast down calibration for the CT. My CT was way off relative to a torque tested PT hub a few years ago until I voided the CT warranty and manually adjusted the CT slope via the hidden adjustment potentiometer accessible through the small access hole on the inside of the CT load unit. IME, the accuracy of individual Computrainers varies quite a bit and they also tend to drift a fair amount at even moderate workloads unless you actively cool the braking unit.
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