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

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