Headset is knocking a bit, probably because it was loose in the Surrey Hills. Can I use any 1" headset to replace it and take a 21.1mm stem??
Assuming you mean a 1" (22.2mm) stem; you can use any 1" threaded headset, provided the stack height works with the amount of steerer you have on the forks.
@.gaz. started
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Headset is knocking a bit, probably because it was loose in the Surrey Hills. Can I use any 1" headset to replace it and take a 21.1mm stem??