Thread: Threadless Conversion Headset
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Old 05-11-18 | 09:40 AM
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joejack951
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Joined: May 2004
Posts: 12,103
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From: Wilmington, DE

Bikes: 2016 Hong Fu FM-079-F, 1984 Trek 660, 2005 Iron Horse Warrior Expert, 2009 Pedal Force CX1, 2016 Islabikes Beinn 20 (son's)

Basic specs:

Converts ISO 1"-24 threaded to 1 1/8" threadless (dia. 30.2mm cups, dia. 26.4mm crown race)
Sealed steel cartridge bearings with Buna-N dust seals, top and bottom
Uncut weight: 265 grams
Uncut threadless steerer tube length: 90mm
Minimum cut length: 38mm (includes 2.5mm for top cap)
Lower stack height: 12.5mm
Upper stack height: 14.6mm
Steerer tube requirements:
1. Must be 27mm min/45mm max longer than bare headtube measured from fork crown
2. Threads on steerer tube must end no more than 16mm above the edge of the bare headtube (using fork crown as reference)

Installation video:
Last edited by joejack951; 06-20-20 at 05:20 PM. Reason: Added steerer tube requirements and install video
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