Neco Headset Expander Top Cap Star Nut Plug Bolt Stem Expanding Nut Bolt Carbon Fiber Cap Cover Long Large Size

This is a little different than some headset expanders becasue the cover and top bolt are combined. It seems to work well.

Not for weight weenies but if you want full protection of carbon steerer that has 35mm of spacers this one does the trick

Ok I will try to save you some time, take the top cap completely off. The screw hole is a larger allen, hold to get it started, tighten to expand then install the top cap to tighten the fork.

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.

Easy to install with a good grip.

Wont slip down in to fork tube because of ridge at top. Extends all the way down past headset bearing, giving support inside entire carbon fork tube. The top of my expensive fork had been overtightened with a small 3/8 inch long vertical crack starting at top of tube. I didn't want to cut the fork down any further so sought something that would provide more clamp support within the fork tube. After fitting this part and riding a couple of hundred miles on gravel, I disassembled for inspection and the crack has not expanded, I believe due to the support added behind the clamp area of the stem clamps. A bit heavy (alloy) but worth it for peace of mind.

Not what I thought it was

I always prefer compression plugs over star nuts. But especially with carbon steerers, the longer length of these is superior to the small ones which only apply force to a small are of the steerer tube. It applies less force over a larger area, putting less stress on the steerer, and preventing damage from over expanding the tube, or compressing it by putting the stem on too tight. Give you a much better and safer mounting. That's worth the handful of grams more the larger ones weigh over the ultralight plugs from other companies.

I'm 225lbs, and do a lot of 'under biking' on my gravel bike, hitting single track around my home on rides wherever I can. I started having some headset issues, and realized the stock ENVE expansion plug I was using on my ENVE fork really didn't offer a lot of support for my stem, and came nowhere near my top headset bearing.I bought the longest version of this Neco plug, and it offers great support for my entire stem clamp area, and goes all the way past my top headset bearing, significantly reducing the likelihood of a steertube failure. I did end up swapping the end wedges from the ENVE version - they are lower profile, so didn't change the stack height on my stem setup. But it was an easy swap - all threading and basic construction was the same.

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.