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Joseph Kuosac Telescopic Extension For Brompton - Silver - 440x31.8mm

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Bottom Telescopic Extension to fit Brompton bikes. - 31.8mm
Requires 27.2mm seat post or pillar to fit saddle.
Joseph Kuosac seat post - #46148
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Questions & Answers (1)
Some questions about this seatpost
28 Apr 2018
1. Is it correct understood that this is the bottom part of a telescopic seatpost that will fit all Bromptons, but contrary to the original seatpost, it will allow a top part with size 27,2mm (which gives many more choices for the top part, ex. suspended seatposts)) instead of 26,6 mm on the original Brompton telescopic seatpost?

2. Are all fittings (sleeve clamp screws etc.) included with this seatpost or can I move fittings from my old original Br. tele-seatpost to this one? If not, which fittings will I then need to buy?

3. I conclude that this seatpost must have thinner walls than the Br. seatpost. Is it just as stable/stiff as the original one?


Hi there,

Yes this is a aftermarket telescopic allowing the use of a 27.2mm upper.

You simply need this post, an upper seatpost and SJS Cycles part number : 46166

We have had no issues with the strength or stability of this seatpost.