KS LEV Si Oil Pressure Cartridge

You likely need a replacement if your seatpost is sluggish, fails to return to full extension, or feels inconsistent during compression. If you have already performed a standard cable tension adjustment and the post still isn't performing correctly, the internal hydraulic cartridge is usually the culprit.

No, this specific cartridge is designed for the 27.2mm diameter model with 65mm of travel. You must match the cartridge to your specific post's diameter and travel length, as they are not interchangeable across different sizes.

Yes, if you are comfortable with basic bike maintenance and have the necessary tools to disassemble your seatpost. However, it requires opening the post, so ensure you have the correct KS service guide or manual for your specific LEV Si model before starting.

Yes, this is a sealed, self-contained hydraulic unit that comes pre-filled and ready for installation. You do not need to bleed or add oil to the cartridge itself.

Often, yes. If the seatpost is 'sinking' or sagging while you are riding, it usually indicates that the internal seals or the hydraulic locking mechanism within the cartridge have failed. Replacing the cartridge is the standard fix for this issue.