what is a fixie bike

{"cid":"91203272","title":"Single Speed fixed gear fixie bike","imgUrl":"https:\/\/img.chinax.com\/nimg\/16\/b6\/f4d360a9c9462c444991b81b95a1-200x200-1.jpg","attrs":{"Price":"USD150-180\/SET","Brand Name":"A-team","Model Number":"Steel","Minimum Order Quantity":"150SETS","Delivery Time":"3MONTHS","Certification":"ISO","Place of Origin":"CHINA","Payment Terms":"T\/T, Western Union, MoneyGram, L\/C","Supply Ability":"30000SETS\/MONTH","Packaging Details":"CARTONS","MATERIAL":"Steel","WHEEL SIZE":"700C","COLOR":"Black","WEIGHT":"10KG","DROPOUTS":"Horizontal","WHEEL SET":"Deep V","HUB":"FLIP-FLOP","GEAR":"44x16","HANDLEBARS":"Riser Bars","BRAKES":"Caliper Hand Brakes","PEDALS":"Platform"}}

{"cid":"91201013","title":"28.6mm Carbon Fiber Road Bike Handlebars Aero Bar Rest Racing Handlebar Aerobar","imgUrl":"https:\/\/img.chinax.com\/nimg\/cf\/b7\/6dc229f995700325f0b1a1d7c61a-200x200-1.jpg","attrs":{"Price":"Negotiable","Brand Name":"Tasuns brand","Model Number":"Bike carbon fiber components","Minimum Order Quantity":"300 pcs","Delivery Time":"15-20 days for sample","Certification":"CE, SGS, ISO","Place of Origin":"Dongguan, China","Payment Terms":"T\/T, Paypal, L\/C","Supply Ability":"500pcs per week","Packaging Details":"Carton box bubble wrap inside or customized","Material":"Carbonio fibre composite","Shape":"Bending tube","Finish":"Matte\/ high glossy","Size":"28.6mm","OEM\/ODM":"by custom design","Processing":"CNC machining","Working temp":"-70~80\u00b0C","Application":"Carbon fiber bike parts"}}