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

£29.99 Please note this product has selling restrictions to your country. was
Manufacturer : 
SJS Cycles part number : 
Manufacturer part number : 
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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Stem extension - 25.4mm?
30 Dec 2017
Under specification title it is listed clamp diameter 25.4mm. Elswhere it is mentioned 1 1/8" like i'lile it to have in the clamp internal measure whereas the stem extension part outer diameter?

Please contact me before you send my order!

To what that 25.4mm refers to?
Hi there,

The clamp is 28.6mm / 1.1/8th, this is the same on the clamping area for the secondary stem.