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Thorn Tandem Stoker Stem Extension for 1 1/8" Stems 17 Deg - Black - 120mm

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Allow the fitting of any regular ahead stem to give a truly adjustable position, internal diameter 28.6mm. A shim is required to fit this to smaller seatposts. Will also fit to 1 1/8" steerer tube and can be used to get a variety of positions on any bike with 1 1/8" steerer.

Measures 120mm end to centre of clamp, 90mm of which is usable. 28.6mm diameter on clamp and extension.
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