Feb. 7, 2019, 2:30 p.m. -  Allen Lloyd

I conceptually like this, but the price and battery concern me. Where I think this could have some huge benefit is if connected to gps and riding history. Imagine if the bike knew a hill was coming up and it automatically shifted for you.  Some cars use similar tech to shift based on gps data.   My fear is people will just start using this with Strava to prove they are pushing a bigger gear on the trail :(