These seat tube reducer sleeves are aluminum alloy adapters that convert larger seat-tube diameters to standard seat posts. They are lightweight, corrosion-resistant, and easy to install.
Use them when upgrading components or adapting a new post to an older frame. They help keep alignment and reduce movement at the junction.
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Material: aluminum alloy—lightweight and corrosion resistant.
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Compatibility: eight conversion options (27.2→25.4, 28.6→25.4, 28.6→27.2, 30.4→27.2, 30.8→27.2, 31.6→27.2, 33.9→27.2, 33.9→31.6 mm).
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Length: about 6 cm per sleeve.
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Weight (per piece): ranges from ~11 g to ~69 g depending on size.
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Installation: simple slip-on use; no tools required.
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Package contents: 2 sleeves included.
Specifications: sleeve length ≈ 6 cm; material aluminum alloy; compatible diameters listed above; contains 2 sleeves.
Fit: suitable for seat tubes and posts matching the listed diameters; verify measurements before installation.
