Originally Posted by
Prim8
If you are looking for a cheap power meter option, I have a PowerTap PowerCal that if I remember correctly was around $100. While not considered a true (it uses an algorithm based on heartbeat) power meter. I have been using it for a couple of years and I like it. While definitely not as accurate as a true power meter it works well for what I do.
How is that different from the guesstimate Garmin/Strava/MMR/RWGPS make based on weight, speed, and HR?