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High-quality materials: this quick release seat post is made of high-quality aluminium alloy, which is a durable and rust-proof alternative. It can add beautiful colours to your car and make it easy to adjust the height of the seat post Easy installation: this seat post clamp adopts the quick release design, which is easy to install and use Safe and stable: the robust mounting screws ensure their durability. Robust roads do not change the seat height Suitable for: suitable for road bikes, mountain bikes, folding bikes, tracked bikes, fixed gears, etc.; It is an excellent accessory for any style of bike Size: 34.9. Suitable for 30.8 / 31.6 mm; Product description Description: Wall thickness: m ± 0.2 mm. Calibre: suitable for seat tube with 30.8/31.6 mm calibre Size: 34.9 Suitable for 30.8 / 31.6 mm Material: carbon fibre Package contents: 1 x bicycle seat post. It contains only the above package contents, not other products. Note:Light shooting and different displays may cause the color of the item in the picture a little different from the real item.The measurement allowed error is +/- 1-3cm.; Product description Description: Wall thickness: m ± 0.2 mm. Calibre: suitable for seat tube with 30.8/31.6 mm calibre Size: 34.9 Suitable for 30.8 / 31.6 mm Material: carbon fibre Package contents: 1 x bicycle seat post. It contains only the above package contents, not other products. Note:Light shooting and different displays may cause the color of the item in the picture a little different from the real item.The measurement allowed error is +/- 1-3cm.; Description: Wall thickness: m ± 0.2 mm. Calibre: suitable for seat tube with 30.8/31.6 mm calibre Size: 34.9 Suitable for 30.8 / 31.6 mm Material: carbon fibre Package contents: 1 x bicycle seat post. It contains only the above package contents, not other products. Note:Light shooting and different displays may cause the color of the item in the picture a little different from the real item.The measurement allowed error is +/- 1-3cm.