You can know the specifications of the reducer sleeve. Material: Aluminum Alloy.
PLATTBK Bike Seat Post 25.4/27.2/28.6/30.9/31.6 350mm Aluminum Alloy Road Bike MTB Seatpost(30.9MM)
PLATTBK Bike Seat Post 25.4/27.2/28.6/30.9/31.6 350mm Aluminum Alloy Road Bike MTB Seatpost(27.2MM)
PLATTBK Bike Seat Post 25.4/27.2/28.6/30.9/31.6 350mm Aluminum Alloy Road Bike MTB Seatpost(25.4MM)
PLATTBK Bike Seat Post 25.4/27.2/28.6/30.9/31.6 350mm Aluminum Alloy Road Bike MTB Seatpost(31.6MM)
CYSKY Bike Seatpost 27.2 x 400mm with 4 Size Bike Seatpost Shim 28.6mm 30.4mm 30.9mm 31.6mm, Bicycle Seat Post for Mountain Bike Road Bike MTB BMX
CYSKY Bike Suspension Seatpost 27.2 x 350mm with Bike Seatpost Shim 28.6mm 30.9mm 31.6mm, Shock Absorber Bicycle Seat Post for Mountain Bike Road Bike MTB BMX
