Review on Enhanced Performance with EC90 Carbon Fiber Bike Seat Post - 3K Seatpost for MTB Road & Mountain Bikes Cycling by Justin Munajj

Broke on first ride. Only driven 9.5 km, all smooth. Hit a small bump at low speed - just started from a stop at a stop sign - and suddenly the seat seemed to tip over. I stopped thinking that I would have to tighten the clamp to prevent tipping (used the lower torque settings I found online as nothing came with the seatpost) and found that it had broken through what should be the strongest part. seat post, collar. Very disappointed