Neco Headset Expander Top Cap Star Nut Plug Bolt Stem Expanding Nut Bolt Carbon Fiber Cap Cover Long Large Size (Extra Large Alu Cap 1-1/8)

I was a little concerned by the people who posted reviews saying this compression plug slipped, even when torqued to spec. But, I decided to take a chance because I wanted something longer than usual in order to provide extra strength to the carbon steer tube.As it turned out, this design is no different than any other (except for the length). It is made well, and has a surface that is textured to grip well on the inside of the steer tube. It worked as expected, and just as well as any other.I question whether the people who said it slipped were in fact applying too much torque to the cap screw. Too much torque would definitely cause even a properly secured expanding compression plug to slip, but it's important to know that very little torque is actually needed when tightening down the capscrew. Apply just enough to prevent the headset from knocking. On my bike that was only about 3 N-m. Any more and you'll ruin your headset (the bearings).One other thing, the title -- Neco Headset Expander Top Cap Star Nut Plug Bolt Stem Expanding Nut -- is incorrect because this is neither a headset, nor a star nut. A better title might be "Neco Steertube Compression Plug / Expanding Nut, includes top cap".

Bought 80mm for my MTB, works just fine. And was delivered on time. Thanks!Nope, did not work well. I replaced it with conventional starnut.

I bought the long one for my carbon steerer tube, and it is working fine with the extension I put on. I figure it'll give the tube some beef to strengthen it.

Got the extra large, to ensure my stem was well supported. Fit perfectly …a must have for carbon forks. Love it

Buy the long one. Trust me. My Marin gravel bike has a carbon steer tube. The expansion plug that came with it only went about 1 inch (25mm) into the steer tube. My stem sits well below this and was therefore clamped onto an unsupported area of steer tube. The long option is about 3 inches long and goes well past the top bearing. Exactly what I wanted. No worries about crushing carbon steer tube. Expansion plug comes dry, not greased. Pull it apart and add some heavy duty/wheel bearing grease on THE INSIDE sliding/metal to metal contact areas of plug to improve installation. Do not put grease on outside of plug. Use a torque wrench.