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Thorn Tandem Stoker Stem Extension for 1 1/8" Stems 28 Deg - Black - 170mm

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Allows 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 seat posts. Will also fit 1 1/8" steerer tube and can be used to get a weird position on any bike with 1 1/8" steerer.

Measures 170mm end to centre of clamp, 140mm of which is usable. 28.6mm diameter on clamp and extension.
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Questions & Answers (1)
Whats The Inside Diameter Of The Extension?
19 May 2015
SJS Customer Service:

The internal diameter of the extension is 23.2mm.