Originally Posted by
noglider
Why is knowing your heart rate important to you? Do you measure it to check your health? Do you use it to ensure you get an adequately vigorous workout?
Various apps/websites use HR data for training load. I like seeing it to gauge my effort level. In other words, you get to know what you can sustain and what HR that typically is. It's good to keep yourself from overdoing it at the start of a long ride.
If you have a power meter you might use that instead.