Extended Telescopic Seatpost for Brompton A C T P line
Units in Stock: 39
This seatpost will fit the following Brompton folding bikes:
A Line / B75
C Line / All Steel Brompton
CHPT 3 - all versions
P Line
Brompton Electric
The outer tube length is 50cm, the inner tube length is 28cm, and the maximum total length is 70cm.
Material aluminium
The outer tube diameter is 31.8mm and the inner tube diameter is 27.2 mm.
The total weight is 430g, and the maximum load is 110kg.
The Brompton seatpost has a 31.6 mm diameter through most of its length
The seatpost is installed on the Brompton from underneath
Remember: Never lubricate the seatpost
Product Code: cFALUkx
Product Condition: New
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Super light seat post but needed slight adjustment.
Duncan
Saturday, May 16, 2026
Very light, not much heavier than the 600mm super light T-Line seat post I was replacing. Only flaw in design is that it doesn t have a swaged or flared end that prevents it coming out of the bike frame seat tube. However, I used an old Brompton seat bung to replace the one supplied and it has a wider end that does prevent it coming out. Seems to have quite a flex so time will tell how robust it is. That s the balance between lightness, length, and flex.