Old 12-28-17, 09:05 AM
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I'd have the split in the shim, facing the same way as the split in the stem.

Because the stem clamp needs to be able to close down and grab the underlying steertube, and they'll have a harder time doing that if they're trying to grab onto the side of a shim that isn't split to allow compressing.

Your Preload cap needs to transfer load down to the headset upper race.
You will do that either through the shim, or through the stem; depending on which one makes contact with that race.
It's a question of what's going on down below where they touch that will make the determination.
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