Chris King designed the first sealed bearing headset in 1976.
it means, that the top nut, doesn't need any thread so locks into the bottom nut. so threaded = 33mm with top nut = 38mm
@31trum started
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it means, that the top nut, doesn't need any thread so locks into the bottom nut.
so threaded = 33mm
with top nut = 38mm