Christ! ITM even sell stems with shims included.
As do Deda and Ritchey. The stem/steerer shim seems like the safest one of the three mentioned, as the axial load is taken by the headset/top cap and there's very little torque load.
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As do Deda and Ritchey. The stem/steerer shim seems like the safest one of the three mentioned, as the axial load is taken by the headset/top cap and there's very little torque load.