Simply need to place the gauge inside the seat tube.
Tool Saddle Head Bike Seatpost Clamps Pipe Head Tube Clamp Bicycle Screw Seat
Bike Seatpost, Bicycle Seatpost For 27.2/28.6 x 300/350/400 mm, Spring Spring Seatpost Seatpost Made of Aluminum Alloy for MTB Road Bike BMX eBike (Black, 28.6 x 300mm)
ROADNADO Bicycle SeatPost, Carbon Fiber Bike Seatpost Matte 27.2 * 400mm Adjustable Seatpost for MTB Road Bike BMX Seattube
Teyssor Bike Seatpost 25.4/27.2/28.6/30.9/31.6mm Bicycle Seat Post Aluminium Alloy Seatpost for Mountain Bike Road Bike BMX
UPANBIKE Bike Seat Post Length 350mm Aluminum Alloy Bicycle Seatpost for Mountain Bike Fixed Gear Bike Seatpost(28.6mm)
GUB Bike SeatPost Seat Post Clamp Tube Clip Quick Release Aluminium Alloy MTB Seatpost Clamp Mountain Road Bike Parts 34.9mm 31.8mm (SBLACK34.9)
