Review on 🚲 CYSKY 350mm SeatPost: Versatile Bike Seat Post for MTB, Road, and BMX Bicycles (Aluminum Alloy, Black) by Michael Miles

Seems strong. Fits perfectly in the seat tube. I only rode about 200 feet to test the seat, so I can't comment on the rack's durability. So why the low rating? The screw (mine was 6mm, not 8mm like others have said) holding the seat rails was so tight I couldn't loosen it. And I have long allen wrenches with handles that bike shops use that you can apply a lot of force to. So how did I weaken it? Not having a vise, I put a pipe wrench on the seatpost, another pipe wrench on the allen handle, pretended to be an incredible mass and it almost didn't work.