KS eTENi/E30iS Air Pressure Cartridge

This cartridge is designed specifically for KS eTENi and E30iS models with 125mm of travel. Because dropper post internals vary significantly by model and production year, you should verify your seatpost model name and travel length before purchasing, as this part is not compatible with OEM-branded versions of KS posts.

This is the core internal mechanism only, often referred to as an air or oil pressure stick. It does not include external seals, bushings, or the remote cable assembly, so ensure you have the necessary tools and any additional service kits required for a full rebuild.

If you are comfortable with basic bicycle maintenance and have the correct tools to disassemble your seatpost, you can perform this swap yourself. However, it requires careful handling to avoid damaging the internal seals, so consult the KS service manual for your specific model before starting.

You likely need a new cartridge if your seatpost is sagging under weight, failing to return to full extension, or feels inconsistent when you actuate the lever. If you have already checked your cable tension and the post still isn't functioning correctly, the internal pressure assembly is usually the culprit.

No, this cartridge is engineered specifically for the eTENi and E30iS series. Internal cartridges are highly specific to the diameter, length, and actuation mechanism of the post, so using this in a different model will result in a poor fit or complete failure to function.