I believe you need to connect a trainer or power meter to first see the Drops, here is a thread that reported the same issue: I am level 24 and have 0 Drops - #11 by Daren
I believe you need to connect a trainer or power meter to first see the Drops, here is a thread that reported the same issue: I am level 24 and have 0 Drops - #11 by Daren