Full Carbon Fiber Bicycle Seat Post Durable Mountain Road Bike Post Tube Cycling Parts For Mtb Seatpost 350/400 27.2/30.8/31.6mm - Bicycle Seat Post

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Used this model a lot. No issues, no sliding or so! Make sure, you NEED a saddle with a pressure relief gap, so you can reach the top screw with a hex key. As it is carbon, also apply carbon paste to increase the friction so it doesn't slide back all the time. They seem to have changed the name from EC90 to