building a fixed gear bike

{"title":"BXT Fixed Gear Bikes 700C Full Carbon Fiber Track TT Complete Bicycles","imgUrl":"https:\/\/img.silkroadsl.com\/nimg\/e5\/b3\/49984af5d8957727495a69083ded-200x200-1.jpg","attrs":{"Brand Name":"BXT","Model Number":"BXT-Track-045","Minimum Order Quantity":"1","Delivery Time":"7-14 days","Place of Origin":"China","Payment Terms":"D\/A, D\/P, T\/T, L\/C","Net Weight":"11kgs","Product name":"700C Carbon Road Complete Track 045","Product Original":"Guangdong, China","Frame Size":"49,51,54,57cm","Material":"T1000 Carbon Fiber","Package Size":"142cmX23cmX76cm","Package Weight":"13kgs","Lead Time":"10 days","Warranty":"2 Years","Customizable":"Acceptable"}}

{"title":"Hard Frame Hydraulic Disc Brake Gravel Bike 9.5kg 22 Speed Gears","imgUrl":"https:\/\/img.silkroadsl.com\/nimg\/fb\/26\/88fdd56c4cb22909e1547c4e9298-200x200-1.jpg","attrs":{"Price":"Negotiable","Brand Name":"SAVA","Model Number":"R11-R8020 Gravel road bike","Minimum Order Quantity":"5","Delivery Time":"15-20 working days","Certification":"ISO\/CE","Place of Origin":"China","Payment Terms":"T\/T, L\/C","Supply Ability":"5000pcs\/month","Packaging Details":"130 \u00d7 20 \u00d7 70 cm","Color":"Black grey","Size":"47cm,51cm,54cm,56cm","Material":"T800 Carbon Fiber","Weight":"9.5kg","Load Capacity":"160kg","Type":"Gravel Road bike"}}