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Amazon.com : BIKEHAND Bike Bicycle Aluminum Seat Tube Seatpost Size - Measurement Sizing Gauge - Quick Measuring Sizer Tool - 25mm to 34.9mm : Sports & Outdoors
![Amazon.com : UPANBIKE Bike Seat Post 13.8inch (350mm) Bicycle Aluminium Alloy Seat Post with Micro Adjust Clamp φ 25.4 27.2 28.6 30.9 31.6mm(25.4mm) : Sports & Outdoors Amazon.com : UPANBIKE Bike Seat Post 13.8inch (350mm) Bicycle Aluminium Alloy Seat Post with Micro Adjust Clamp φ 25.4 27.2 28.6 30.9 31.6mm(25.4mm) : Sports & Outdoors](https://m.media-amazon.com/images/I/51e4A8G9QGS._AC_UF1000,1000_QL80_.jpg)
Amazon.com : UPANBIKE Bike Seat Post 13.8inch (350mm) Bicycle Aluminium Alloy Seat Post with Micro Adjust Clamp φ 25.4 27.2 28.6 30.9 31.6mm(25.4mm) : Sports & Outdoors
![Amazon.com : UPANBIKE Bike Seat Post 13.8inch (350mm) Bicycle Aluminium Alloy Seat Post with Micro Adjust Clamp φ 25.4 27.2 28.6 30.9 31.6mm(25.4mm) : Sports & Outdoors Amazon.com : UPANBIKE Bike Seat Post 13.8inch (350mm) Bicycle Aluminium Alloy Seat Post with Micro Adjust Clamp φ 25.4 27.2 28.6 30.9 31.6mm(25.4mm) : Sports & Outdoors](https://m.media-amazon.com/images/I/61l0ryzHfqS._AC_UF350,350_QL80_.jpg)