Nitto stems are measured weirdly:
https://www.bikeforums.net/classic-vintage/605227-nitto-pearl-stem-sizing.html
All stems are measured the same.
Nitto just use reach rather than extension.
Reach makes way more sense (imo).
Not sure I quite follow. My (level) Nitto quill stem is 11.5cm, measured from the center of the insert to the center of the clamp. It's advertised as 10cm in length. Surely that's weird?
@tallsam started
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Nitto stems are measured weirdly:
https://www.bikeforums.net/classic-vintage/605227-nitto-pearl-stem-sizing.html