TH-857
by FSA
FSA TH-857 – External 1-1/8'' Threadless Headset
Description
The FSA TH-857 is a durable, heavy-duty external cup headset designed for 1-1/8'' threadless steerers.
Featuring deep 12 mm steel cups, a nylon top cover, and plastic seal, this headset is built for longevity and reliable performance.
Oversized lower bearings improve load distribution, making it a strong choice for MTB, hybrid, and rugged commuter applications.
Specs
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Deep cup design: 12 mm
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Nylon top cover with seal
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Forged and CNC-machined steel cups
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Upper bearings: O5/32" × 20 retainer
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Lower bearings: Oversized O3/16" × 20B retainer
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Stack height: 12.8 mm + 11.9 mm = 24.7 mm
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Weight: 149 g
Attributes
Bearing Grade: Heavy-duty caged ball
Crown Race Diameter: 30 mm
Lower Cup: 34 mm
Headset Type: External, Threadless
Upper Cup: 34 mm
Headset Weight: 149 g
Misc: Oversized 3/16'' × 20B retainer bearings
Primary Color: Black
S.H.I.S.: EC34/28.6 | EC34/30
Steerer Tube: 1-1/8''
Stack Height: 24.7 mm
Headset Position: Complete
SHIS Upper: EC34/28.6
SHIS Lower: EC34/30