The Person Mountain Biking: Medium Skin Tone emoji is a modifier sequence combining ? Person Mountain Biking and ? Medium Skin Tone. These display as a single emoji on supported platforms.
Person Mountain Biking: Medium Skin Tone was added to Emoji 2.0 in 2015.
U+1F6B5
U+1F3FD
?? Mountain bicyclist
?? Emoji modifier fitzpatrick type-4