Headset (bicycle part)
Fork dimensions

Headset (bicycle part)

Section Title: Fork dimensions
Table Section Text: None

Fork standard	Stem-clamp diameter (nominal)	Crown-race seat diameter (nominal)

1" ISO	25.4 mm	26.43 mm

1" JIS	25.4 mm	27.03 mm

1⅛"	28.6 mm	30.015 mm

1¼"	31.8 mm	33.0 mm

1.5"	38.1 mm	39.76 mm

Sentence(s)

1.5" (38.1 mm) is used in the OnePointFive Standard.

final_sentence: 1.5" (38.1 mm) is used in the OnePointFive Standard.