I was recently shopping for bicycle power meters because I want to know exactly how bad I am at pretending cars don't exist (I'm slow, folks). There's been an explosion in direct-to-consumer companies making them. I was looking at a self-installed crank strain gauge model where the tradeoff is that in exchange for your own DIY skills and time it costs less than half what pedal meters would cost. But I found out the company folded, the app isn't supported anymore meaning you can't calibrate the unit, so you might end up being unable to do anything with one of the units you happen to come across. Brutal!

https://www.dcrainmaker.com/2017/02/watteam-powerbeat-gen2-p...