Both the carbon and alloy 2022 Altitude Powerplay require a 30.9mm diameter seatpost/dropper post.
Max Seatpost Insertion
Dropper post length is dependent on a few factors; the first being your saddle height and the second being the maximum seatpost insertion depth which you’ll find listed below. Using the values in the chart below and the charts supplied by the dropper post-manufacturer, you should be able to determine which dropper post length is best for you.
|Altitude PP Carbon||190mm||235mm||240mm||290mm|
|Altitude PP Alloy||150mm||195mm||200mm||250mm|