How to choose a specification? 1. Measure the outer diameter of the seatpost 2. Measure the inner diameter of the middle tube of the frame Features: With this seatpost adapter, a 25.4mm seatpost can be converted to a 27.2 seatpost. The seatpost adapter spacer helps you to change the outer diameter of your bicycle seat tube, you can easily adjust the diameter of your bicycle seatpost without the hassle of repurchasing bicycle seatpost.
Material: aluminum alloy Length: 60MM Specification: 22.2 To 25.4mm 25.4 To 27.2mm 25.4 To 28.6mm 25.4 To 30.9mm 25.4 To 31.6mm 27.2 To 33.9mm 27.2 To 28.6mm 27.2 To 30.8mm 27.2 To 31.6mm 27.2 To 30.4mm 28.6 To 31.8mm 30.9 To 36mm 30.9 To 31.6mm 31.8 To 34.9mm 31.6 To 33.9mm 33.9 To 34.9mm 27.2 To 30.9mm 27.2 To 30mm 30.9 To 33.9mm