If the standard Brompton seatpost isn't tall enough for you, you need the extended steel seat post! Gain 60mm more height. Suitable for riders with a maximum inside leg measurement of 89cm.
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The Brompton Extended Seatpost (steel) is longer than the standard option by a further 6cm (2.5 inches) and is a single post. When the bike is folded the saddle sits higher by the same amount (6cm or 2.5 inches).
It may be worth considering the Telescopic seatpost if you need to store the folded bike in a height-restricted space.
Suitable for riders with a maximum inside leg measurement of 89cm (35 inches).