Number of miles multiplied by tyre width (2" is #FSrealsuppleride2, 3" is #FSrealsuppleride3, 4" is #FSrealsuppleride4). Capital Bikeshare rides tagged with #CABI automatically count as 2" tyre rides, see also CABI rides
#FSrealsuppleride2
#FSrealsuppleride3
#FSrealsuppleride4
#CABI