The conversation between human and AI assistant.
[|Human|] What type of terrain is a gravel bike used for?
[|AI|] Gravel bikes are a do-it-all kind of bike. They are effective on a wide array of terrain, ranging from smooth roads to singletrack trails, but thrive on harsher off-road terrain.
[|Human|] 
What type of terrain is a gravel bike used for?