Re: PowerTap innacuracy?!?
Originally Posted by gza
I've been banging on for ages for people to check their PT's but blind faith in the product seems to rule the day - there seem to be more and more cases of people finding out of spec product recently.
The only way to know for sure if your PM is reading correctly is to directly calibrate it using known weights. It seems like a hassle but I calibrate mine with weights from 5-35kg in 5kg incrediments in about 20mins - well worth it for peace of mind!
SRM's seems to get more stable with time, but you sure can't trust the factory calibration - if you are into powermeter data at some point you will fall foul of an calibration drift over the years if you don't periodically check them - I test mine every 3 months now.
Gettin PT in the next few days so would like to start off on the right track!