Seatpost Shims

Part Number: SHIM

Price From: $16.00 (MSRP)

* Required Fields

Shims for fitting a seatpost in a frame with a larger seat tube diameter. Allows a smaller diameter seatpost to be used in a frame that was originally manufactured to use a larger seatpost size.

  • Use the charts listed below to find the correct shim size.
  • Inner diameter is the seatpost size you intend to use.
  • Outer diameter is the seatpost size that your frame was originally manufactured to use.

(Note: Some larger OD shims are Delrin. Refer to chart below.)

Precision Machined

Wheels Mfg Seatpost Shims

Double click on above image to view full picture

Zoom Out
Zoom In

More Views

Select the seatpost size you want to use in your frame:

  • 22.2mm Seatpost (BMX)
  • 25.4mm Seatpost
  • 27.2mm Seatpost
  • 30.9mm Seatpost

2" Insertion Length

Part No: Inside Diameter Outside Diameter
SHIM3-25.0 22.2 mm 25.0 mm
SHIM3-25.4 22.2 mm 25.4 mm
SHIM3-26.0 22.2 mm 26.0 mm
SHIM3-26.6 22.2 mm 26.6 mm
SHIM3-26.8 22.2 mm 26.8 mm
SHIM3-27.0 22.2 mm 27.0 mm
SHIM3-27.2 22.2 mm 27.2 mm

2" Insertion Length

Part No: Inside Diameter Outside Diameter
SHIM2-26.0 25.4 mm 26.0 mm
SHIM2-26.2 25.4 mm 26.2 mm
SHIM2-26.4 25.4 mm 26.4 mm
SHIM2-26.6 25.4 mm 26.6 mm
SHIM2-26.8 25.4 mm 26.8 mm
SHIM2-27.0 25.4 mm 27.0 mm
SHIM2-27.2 25.4 mm 27.2 mm
SHIM2-28.6 25.4 mm 28.6 mm
SHIM2-29.2 25.4 mm 29.2 mm
SHIM2-29.4 25.4 mm 29.4 mm
SHIM2-29.6 25.4 mm 29.6 mm
SHIM2-29.8 25.4 mm 29.8 mm
SHIM2-30.0 25.4 mm 30.0 mm
SHIM2-30.2 25.4 mm 30.2 mm
SHIM2-30.4 25.4 mm 30.4 mm
SHIM2-30.8 25.4 mm 30.8 mm
SHIM2-30.9 25.4 mm 30.9 mm
SHIM2-31.4 25.4 mm 31.4 mm
SHIM2-31.6 25.4 mm 31.6 mm
SHIM2-31.8 25.4 mm 31.8 mm

2 1/4" Insertion Length

Part No: Inside Diameter Outside Diameter
SHIM1-28.6 27.2 mm 28.6 mm
SHIM1-29.2 27.2 mm 29.2 mm
SHIM1-29.4 27.2 mm 29.4 mm
SHIM1-29.6 27.2 mm 29.6 mm
SHIM1-29.8 27.2 mm 29.8 mm
SHIM1-30.0 27.2 mm 30.0 mm
SHIM1-30.2 27.2 mm 30.2 mm
SHIM1-30.4 27.2 mm 30.4 mm
SHIM1-30.8 27.2 mm 30.8 mm
SHIM1-30.9 27.2 mm 30.9 mm
SHIM1-31.4 27.2 mm 31.4 mm
SHIM1-31.6 27.2 mm 31.6 mm
SHIM1-31.8 27.2 mm 31.8 mm
SHIM1-32.4 27.2 mm 32.4 mm
SHIM1-34.0 27.2 mm 34.0 mm (Delrin), 4" Insertion Length
SHIM1-34.9 27.2 mm 34.9 mm (Delrin)

2 -1/4" Insertion Length

Part No: Inside Diameter Outside Diameter
SHIM0-31.6 30.9 mm 31.6 mm (aluminum)
SHIM0-34.0 30.9 mm 34.0 mm (Delrin)
SHIM0-34.9 30.9 mm 34.9 mm (Delrin)