1415
Wait, not like that
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There's ton of weird niche stuff. Mostly cycling related here but you get the point...
Bicycle pedal axle thread size
Bicycle wheel and tire sizing (actually metric standard but inches in common language)
Also wheel size on cars
Bicycle steerer tube diameter
10mm qr axle diameter on hubs (3/8" actually)
25.4mm handlebar clamp diameter sounds oddly familiar...