🚲 Sumind 9-Piece Carbon Fiber Headset Spacer Kit for 1-1/8 Inch Bicycles - 2/3/5/10/15mm Sizes Review

The inner diameter is a bit sloppy. I wish they had a tighter tolerance on the head tube diameter. But they do their job well enough.

Real carbon! Since my stem and handlebars are CF, I needed the right spacers. It's just them! Various sizes and the quality is top notch! Highly recommended!

Looks fantastic. I'm a hardcore road builder, building a new bike for next season. There are more spacers here than necessary and they fit perfectly. I highly recommend it.

Nice carbon spacers for the price. My reason for 3 stars is because of the thickness (walls) of the rings and the whitish coating around the edges. My old set was a little thinner with black edges which looked better overall when installed with a black stem, headset and handlebars.

Actually heavier than the aluminum spacers (with a specific minimum cross-section) that came with my Cube mountain bike. Except for these spacers, I have converted almost all parts of my bike to carbon. They are carbon but they have been in my storage box for over a year.

Have these for my BMX race, class and cruiser bikes. They are lighter than the pads that come with the bikes. At the same time, the diameters are slightly different from the current spacers. Do not buy them if you lose weight (the difference can only be seen on the scale, not on the trip). They look cute and do their job as advertised. I am very satisfied and will buy them for my future builds!

These picks are not 100% carbon fiber. I suspect they are made from a thin layer of real carbon fiber over fiberglass. I came to this conclusion by separating the layers and checking the electrical resistance of each material since carbon conducts electricity but fiberglass does not. Of course, the black outer layer had very low resistance, and the lighter inner layers were electrically insulating, confirming my suspicion that these gaskets weren't 100% carbon fiber. Will they work? YES SIR…