Wheels Manufacturing Aluminum Seatpost Shim Converts 25.4 to 31.6 Made in USA, 4.4mm shim, 27.2 seatpost to 31.6, Wheels Manufacturing SHIM1-31.6 Aluminum Seatpost Shim 27.2-31.6, New Taiwan made seat tube shim, downsize from 31.6mm to 27.2mm, 4.4mm shim, 27.2 seatpost to 31.6, gobike88 KREX Seat Tube Shim 27.2mm to 31.6mm, 80mm long, “Redbike” New Taiwan made Ø31.6 Seatpost to Ø27.2 Seat tube shim adapter 80mm, Problem Solvers Bike 4.4mm Seatpost Shim 27.2 to 31.6mm, Wheels Manufacturing SHIM-27.2 I.D./31.6 O.D., Seatpost Spacer 27.2/31.6 Seat Post Shim Black 545-004, 4.4mm shim; 27.2 seatpost to 31.6, SEAT POST SunLite SHIM 25.4id31.6od ALY, Wheels Manufacturing SHIM-25.4 I.D./31.6 O.D., POST MODERN ALLOY 26.0MM TO 31.6MM SEATPOST SHIM , Seatpost Spacer 27.2 to 31.6 Suspension Seat Post Shim TS,