Seatpost Shims 100mm Alloy – Various Bike Sizes

100mm Seatpost Shims for Different Bike Seatpost Sizes

These seatpost shims provide a practical way to fit a smaller diameter bicycle seatpost into a wider seat tube. Instead of replacing a suitable seatpost because its diameter does not match your bike frame, the correct shim fills the difference between the two sizes. The 100 mm length also provides a longer contact area than many shorter shim designs.

Key Features

• Designed to adapt smaller bicycle seatposts to wider seat tubes.
• 100 mm length provides a longer contact area.
• Made from painted alloy.
• Available in several common bicycle seatpost size combinations.
• Useful when changing to a seatpost with a smaller diameter than the bike frame normally accepts.

Specifications

• Material: Painted alloy.
• Length: 100 mm.
• 27.2 to 30.9 mm size: approximately 42 g, with a stated weight tolerance of +/- 5%.
• 27.2 to 31.6 mm size: approximately 53 g, with a stated weight tolerance of +/- 5%.
• 30.9 to 31.6 mm size: approximately 9.2 g, with a stated weight tolerance of +/- 5%.
• 31.8 to 34.9 mm size: approximately 43 g, with a stated weight tolerance of +/- 5%.

Benefits

1. Use a compatible smaller seatpost in a frame with a larger seat tube diameter.
2. Choose the correct shim by matching both your seatpost and seat tube measurements.
3. The 100 mm length provides more contact area than many short adaptors.
4. Several size options cover common bicycle seatpost and seat tube combinations.
5. A shim can provide a simple solution when an otherwise suitable seatpost is too narrow for the frame.

Common Questions

• Q: How do I choose the correct seatpost shim?
  A: Measure your seatpost diameter and the internal diameter of the bike's seat tube. The smaller measurement should match your seatpost and the larger measurement should match the seat tube.
• Q: What does 27.2 to 31.6 mm mean?
  A: It means the shim is designed to fit a 27.2 mm seatpost into a bike frame with a 31.6 mm seat tube diameter.
• Q: How long are these seatpost shims?
  A: Each shim in this range is 100 mm long.
• Q: What are the shims made from?
  A: They are made from painted alloy.
• Q: Why choose a 100 mm seatpost shim?
  A: The longer design provides more contact area than many shorter shims and can be useful when adapting between different seatpost sizes.
• Q: Should I measure my bike before ordering?
  A: Yes. Check both your seatpost diameter and the internal diameter of your bike's seat tube before selecting a size.

Summary

These 100 mm seatpost shims offer a simple way to fit a smaller bicycle seatpost into a wider seat tube. Several common diameter combinations are available, making them useful when changing seatposts or adapting an existing bike setup. Measure both the seatpost and frame carefully before selecting the correct size.