Do I need a thin spacer above the (aluminium) stem on a steel fork/steerer? Or is no spacer at all okay? The stem has two bolts, and the top one is probably just about below the top of the steerer.
No spacer necessary. If you’re able to preload the bearings and the bolts aren’t clamping into thin air instead of the steerer, then it’s fine.
@tjmw started
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Do I need a thin spacer above the (aluminium) stem on a steel fork/steerer? Or is no spacer at all okay? The stem has two bolts, and the top one is probably just about below the top of the steerer.