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【Bicycle Seat Post Description】Carbon fiber MTB seat post material: carbon fiber; Appearance:UD/3K matte; Weight: approx. 210 +/- 10g; Diameter: 27.2/30.8/31.6mm; Length: 350/400mm; Offset: 25mm; The carbon fiber seat post is comparable to the aluminum alloy seat post: lighter. more beautiful. Recommended assembly torque (4Nm); 【Adjust saddle angle】The saddle can be adjusted with the screws of the bicycle seat post at the front and rear of the clamp seat to adjust the saddle angle in small increments; Backward offset Unlike straight tubes, the front end of the seat post is offset backwards by 25mm The design increases the distance between the saddle and the stem, can move the saddle further backwards, expands the range of motion of the legs, finds the best riding posture; 【Suitable for Arch Size】This road bike seat post is suitable for attaching to a saddle with a hole. If the saddle does not have a hole, it is recommended to tighten the screw with an Allen wrench. The seat part of the clip is made of high-strength aluminum alloy, one-piece molding, safe and durable; Structure of the upper and lower parts of the clip, arch support cushion. Suitable for bow size: 6*6mm/7*7mm/7*9mm/7*10mm/8*10mm. 【Choose the size of the carbon seat post】1.Choose the same diameter as your original seat post.The original seat post usually has a size mark and you can buy it accordingly.2.Select the size according to the inner diameter of the frame tube. measure the inner diameter of the frame tube and choose the right size; 【Multiple Applications】The carbon road bike seat post is a good match for most road bikes, hybrid bikes, fixie bikes, gravel bikes, fixed gear bikes and track bikes Perfect for female male cyclists, riders, sprinters.