
FSA Gossamer SB20 Seatpost Black, 31.6mm, 350mm
Replacement option
Velopedia Bicycle Archive
Original specifications: Hybrid Mix drivetrain · 26" wheels.
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2009 archived details
Clues, not proof of model year. Colors vary and components may have been replaced.
| Frame Construction | TIG-welded |
|---|---|
| Frame Material | Aluminum |
| Fork | Bianchi |
| Fork Material | Alloy/chromoly steerer, unicrown crown |
| Component Group | Hybrid Mix |
|---|---|
| Shifters | Shimano Alfine Rapidfire Plus |
| Crankset | ProWheel PI-244A, 44 teeth |
| Cassette | Shimano Alfine |
| Rear Cogs | 8-speed internal, 18 teeth |
| Chain | KMC Z610H |
| Pedals | Wellgo LU-206 |
| Brakes | Bianchi RC alloy brakes, Shimano integrated levers |
|---|
| Headset | 1 1/8" VP-A71 |
|---|---|
| Handlebar | Bianchi Alloy |
| Handlebar Extensions | Not included |
| Stem | Kalloy alloy |
| Saddle | Viscount 2503 Steel rail |
| Seatpost | Bianchi RC carbon fiber, 31.6mm diameter |
| Hubs | Front: Joytech JY-761DSE alloy, Rear: Shimano Alfine 8 speed internal |
|---|---|
| Rims | HJC DA-17, 36-hole |
| Front Tire | 26 x 1.50" Kenda K-193 |
| Wheel Size | 26" wheels |
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Original gearing is incomplete. Enter your setup to calculate ratios and cadence speeds.
Your changes apply to this calculation. The archived build stays unchanged.
| Measure | Original | Your setup |
|---|---|---|
| Lowest ratio | — | — |
| Highest ratio | — | — |
| Total range | — | — |
| Lowest-gear speed | — | — |
| Highest-gear speed | — | — |
Speeds are estimates. These calculations do not establish component compatibility or available tire clearance.
Parts & serviceability
31.6mm diameter

Replacement option
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Archived specifications for reference. Check the fitted parts before ordering.
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Archived: Frame: TIG-welded · Fork: Bianchi · Alloy/chromoly steerer, unicrown crown
Archived: Group: Hybrid Mix · Shifters: Shimano Alfine Rapidfire Plus · Crankset: ProWheel PI-244A, 44 teeth · Cassette: Shimano Alfine · Rear cogs: 8-speed internal, 18 teeth · Chain: KMC Z610H
Archived: Brakes: Bianchi RC alloy brakes, Shimano integrated levers
Archived: Wheel size: 26" wheels · Rims: HJC DA-17, 36-hole · Hubs: Front: Joytech JY-761DSE alloy, Rear: Shimano Alfine 8 speed internal · Front tire: 26 x 1.50" Kenda K-193
Archived: Headset: 1 1/8" VP-A71 · Handlebar: Bianchi Alloy · Stem: Kalloy alloy · Seatpost: Bianchi RC carbon fiber, 31.6mm diameter · Saddle: Viscount 2503 Steel rail · Pedals: Wellgo LU-206
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