Lyne Seatpost Shim 30.9 To 31.6Mm
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The Lyne Seatpost Shim 30.9 to 31.6mm is a precision-machined adapter that allows a 30.9mm seatpost or dropper post to be fitted into a bicycle frame with a 31.6mm seat tube. It is made from lightweight 6061-T6 aluminium and is designed specifically for a precise, secure fit.
Key Features
- Converts a 31.6mm frame to accept a 30.9mm seatpost
- Precision-machined construction
- 6061-T6 aluminium alloy
- 120mm length for extended support inside the seat tube
- Lightweight at just 9g
- Suitable for standard seatposts and compatible dropper posts
Specifications
| Specification | Details |
|---|---|
| Brand | Lyne Components |
| Product | Seatpost Shim |
| Seatpost Diameter | 30.9mm |
| Frame Seat Tube | 31.6mm |
| Internal Diameter | 30.9mm |
| External Diameter | 31.6mm |
| Length | 120mm |
| Material | 6061-T6 Aluminium |
| Weight | 9g |
Benefits
- Expands seatpost compatibility: Allows a 30.9mm post to be used with a 31.6mm frame.
- Lightweight: Adds only 9g to the setup.
- Precise fit: Precision machining provides a close-fitting interface between the post and frame.
- Durable: 6061-T6 aluminium provides a strong and corrosion-resistant construction.
Compatibility
This shim is specifically designed for 30.9mm seatposts in 31.6mm seat tubes. It is particularly useful when you have a preferred 30.9mm dropper post but your frame requires a 31.6mm post diameter.
Important: Do not use this shim to fit a 31.6mm seatpost into a 30.9mm frame. The shim works in the opposite direction: 30.9mm post → 31.6mm frame.
Best Suited For
- MTB seatposts
- Dropper-post installations
- Custom bike builds
- Riders upgrading or replacing a seatpost
- Frames with a 31.6mm seat tube where a 30.9mm post needs to be installed
