original_query: What are the different types of bicycles categorized by function?
query: What are the different types of bicycles categorized by function?
answer: Bicycles are categorized by function into road bicycles, touring bicycles, randonneur or audax bicycles, hybrid bicycles, trekking bikes, commuter bikes, city bikes, comfort bikes, flat bar road bikes, cyclo-cross bikes, utility bicycles, cargo bikes, porteur bicycles, butcher's bikes, longtail bicycles, boda-boda, messenger bikes, ice cycles, mountain bicycles, 29ers, 27.5 bikes, downhill bikes, freeride bicycles, fatbikes, racing bicycles, time trial bicycles, triathlon bicycles, track bicycles, BMX bikes, and cruiser bicycles.