Necessary for frames that use integrated headsets. Go above the upper bearing to get just enough space above the frame so that the headset top stack does not interfere with the frame. These are high quality. You do not necessarily need to use them with FSA headsets, I personally used with Cane Creek.
These are exactly what you think they are. I needed them to resolve a clearance issue with an integrated headset on my Giant XTC Composite.
The FSA headset top cap would hit the headtube body on the frame. The microspacers allowed me to shim up the headset top cap for clearance, while still keeping the gap as small as possible to prevent dust/dirt/moisture from entering the headset bearings.
If you need very fine adjustment for your headset, this will do the trick.
These little spacers made all difference on my headset. I have a cone spacer which the lower edge was rubbering the bearings, stucking the steering. I was not understanding why, because the original spacer looks to have exactly the same shave in the bottom. Even the original, the steering movement was not that perfect. Then, I put 2 of these little fellas and Man, what a difference! the steering movement now is really soft and stiff at same time! Essencial spare part to keep into toolbox!
Had issues with an integrated headset and after some research, ended up buying these shims to try and remedy the problem. Turns out it wasn't the headset after all, but something inside the fork. So I did waste a few bucks on these but who knows, I may end up needing them down the line.
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