The Brompton Pentaclip offers multiple adjustments to the position of your saddle, enabling you to get the most comfortable position on your Brompton. Learn how to fit and adjust the Brompton Pentaclip and saddle, to optimise your saddle comfort. NB: The Brompton Advance Pentaclip fitted on T Line and P Line is done up to 10Nm not 15Nm. But the range of adjustment is the same. *The seatpost O-Rings are added to certain bicycle models as additional protection, but please be assured they are not required for the safety or quality of your Brompton.