30 8mm seat post diameter bike frame

{"cid":"91214930","title":"Carbon Fiber T1000 3K Weave Mountain Road Bike Saddle Tube Seat Post","imgUrl":"https:\/\/img.chinax.com\/nimg\/9f\/27\/0ab3a5b8f00a4ab99e4f5a5c9ff1-200x200-1.jpg","attrs":{"Brand Name":"BXT","Model Number":"BXT-SP-006","Minimum Order Quantity":"1","Delivery Time":"7-14 days","Place of Origin":"China","Payment Terms":"D\/P, D\/A, L\/C, T\/T","Material":"T1000 Carbon Fiber 3K","Type":"Mountain Bike Seatpost","Length":"400mm\/350mm","Diameter":"31.6mm\/27.2mm","Torque":"8Nm","Weight":"217g+\/-20g"}}

{"cid":"91198728","title":"Precision CNC Machining Parts Bike 5 X 4 Inches Seatpost Clamp","imgUrl":"https:\/\/img.chinax.com\/nimg\/78\/48\/d37a0ba72188956c5462a6e85b4f-200x200-1.jpg","attrs":{"Price":"$0.80 - $16.00 \/ Piece","Brand Name":"OEM","Model Number":"CNC Machining","Minimum Order Quantity":"10 Pieces","Delivery Time":"15-20 Work Days","Certification":"ISO9001:2015","Place of Origin":"Guangdong, China","Payment Terms":"T\/T, Western Union, Paypal, D\/P, D\/A, L\/C","Supply Ability":"30000 Pieces","Packaging Details":"1. Paper, EPE Foam, poly bag, pp bag packaged for protecting products. 2. Standard carton boxes or wooden boxes 3. We also can pack and ship according to customer's specific requirements.","Product Name":"Precision CNC Machined Seatpost Clamp","Material":"Aluminum","Item Dimensions LxWxH":"5 x 4 Inches","Colors":"Support Customize","Style":"All-season","Item Weight":"0.05 Pounds"}}