Quick Summary
The Sumind 11-piece carbon fiber bike headset spacer set is sized for 1-1/8 inch use and gives you seven spacer sizes in one package. It is a headset spacer set for adjusting handlebar or stem stack height on a compatible bicycle.
The set includes 1 mm, 2 mm, 3 mm, 5 mm, 10 mm, 15 mm, and 20 mm spacers, so you can choose the spacing that matches your setup.
Key Details
| Detail | Product information and buyer relevance |
|---|---|
| Brand | Sumind, which helps identify the exact spacer set. |
| Product type | Bike headset spacers for a 1-1/8 inch setup. |
| Pack count | 11 pieces total, so the pack quantity matters when comparing offers. |
| Spacer sizes | 1 mm, 2 mm, 3 mm, 5 mm, 10 mm, 15 mm, and 20 mm. |
| Inner diameter | Approx. 28.6 mm. |
| Outer diameter | 34.9 mm. |
| Total weight | About 45 g. |
| Material | Carbon fiber is listed in the product name and description. |
What to Compare Before Buying
- Steerer size: This set is for 1-1/8 inch use. Compare that size with your bike’s headset and stem setup before choosing an offer.
- Spacer thickness: The pack includes 1 mm through 20 mm sizes. Check whether you need one thickness or a mix of sizes to reach the height you want.
- Diameter: The stated inner diameter is about 28.6 mm and the outer diameter is 34.9 mm. Match those measurements to your setup if exact fit matters.
- Pack quantity: The set contains 11 pieces total. Confirm that the included quantity fits the build you want to complete.
Before You Decide
Confirm the 1-1/8 inch size, the spacer thicknesses you need, and the exact piece count before choosing an offer. If you are matching an existing bike setup, the listed diameters are the key fit checks.





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