Originally Posted by
ypsetihw
yeah I use Strava too, but the estimates I find are all over the place, especially when I switch bikes or if it's windy. add to that my HR monitor is standalone so it doesn't upload the data to my rides, which means Strava really is just guessing.<snip>
If you switch bikes, you need to switch them in Stava, too. Strava calculates power by speed, assuming no wind, and by rate of ascent. It doesn't use your HR data at all. So if your watts are all over the place on non-windy days, they probably are. What device are you using to record and upload your rides? Offhand I can't think of one that doesn't have a HR recording function. If yours doesn't get one that does and an ANT+ compatible transmitter. They're almost all ANT+ compatible.