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TH Industries 0.25mm 1-1/8 Headset Wafer Shim
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TH Industries 0.25mm 1-1/8 Headset Wafer Shim.
If your headset's top race rubs on the frame, you need one of these!
Its become more and more common now to have integrated bearings in modern frames and quite often the top half of the headset or seal can be a little too tight on the top of the frame, in some cases enough to make correct headset adjustments impossible, either too loose with play or too tight and binding up.
These shims are 0.25 of a mm and designed to sit on top of the headset but underneath the conical top half of the headset and create the correct spacing.
As many of these can be used as necessary, ie if you need 1mm of spacing, use 4.