It doesn't stick well

The replacement air cartridge is for the 27

you can mount any 31

BB30 crankset 386EVO

PNW Components Cascade Dropper Post - V3 - No Remote Supplied - External - 30.9mm - 125mm - 406mm Needs Images It doesn't stick wellThe Cascade is coil spring operated for outstanding durability and low maintenance and features an externally routed cable to fit a wide variety of bikes. The external cable comes from the collar to keep things as neat as possible and it won't get in the way once the post is dropped. 150mm and 170mm options have a larger, stiffer stanchion, and also receive an extra bushing to help fight against 'wobbly post syndrome'. V3 posts have slightly different