guide to buy a bike

{"cid":"91200926","title":"Multispeed Electric Mountain Bike 4.0 Fat Tire Electric Bicycle Beach 15Ah","imgUrl":"https:\/\/img.chinax.com\/nimg\/77\/45\/7356044e780ec6f22a853e95e9d3-200x200-1.jpg","attrs":{"Price":"$799.00\/Pieces 1-9 Pieces","Brand Name":"KETELES","Model Number":"K820","Place of Origin":"Guangdong, China","Gears":"21 Speed","Range per Power":"31 - 60 km","Frame Material":"Aluminum alloy","Wheel Size":"26\"","Max Speed":"30-50km\/h","Voltage":"48V","Power Supply":"Lithium Battery","Braking System":"Disc Brake","Charging Time":">3 hours","Motor position":"Rear Hub Motor","Battery Position":"Down Tube","Battery Capacity":"23Ah","Battery type":"48V 23Ah Lithium Battery","Motor Power":"48V 1000W Rear Hub Motor","Gear":"Shinmano 21-Speed","Display":"Multifuntional LCD Display"}}

{"cid":"91201438","title":"Red SAVA Kids Carbon Bike 24 Inch V Brake Children Bike","imgUrl":"https:\/\/img.chinax.com\/nimg\/c1\/af\/5e1c27fee75ae11e7168ec0aa8fb-200x200-1.jpg","attrs":{"Price":"Negotiable","Brand Name":"SAVA","Model Number":"Kids bike","Minimum Order Quantity":"5","Delivery Time":"12-25 days","Certification":"CE,ISO","Place of Origin":"China","Payment Terms":"L\/C, D\/A, T\/T, Western Union, MoneyGram","Supply Ability":"2000pcs\/month","Frame Material":"Carbon fiber","Fork Material":"Carbon fiber","Useage":"over 4 years old","Type":"Gravel road bike","Size":"24''","Color":"Red"}}