FSA Gossamer SB20 Seatpost Black, 31.6mm, 350mm
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Velopedia Bicycle Archive
2011 Rocky Mountain Metropolis NRT
Original specifications: Shimano mix drivetrain · 28" wheels.
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At a glance
Archive #23651- Model year
- 2011
- Category
- City & Commuter
- Sizes
- 16, 18, 20, 22"
- Colors
- Black
- In this record
- 24 specifications · archived image
Model history 1 other year
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Identification clues
2011 archived details
- Published colors
- Black
- Frame
- Custom RMB
- Original equipment
- Shimano mix
Clues, not proof of model year. Colors vary and components may have been replaced.
Original buildCustom RMB · Shimano mix · 28" wheels
Frameset
| Frame Material | Custom RMB |
|---|---|
| Fork | Alloy |
| Fork Material | Alloy |
Drivetrain
| Component Group | Shimano mix |
|---|---|
| Shifters | Shimano Alfine Rapidfire |
| Rear Derailleur | Shimano Alfine |
| Crankset | FSA Alloy, 45t teeth |
| Bottom Bracket | Cartridge TH 7420 W/Super Water Seals |
| Cassette | Shimano |
| Rear Cogs | 20 teeth |
| Chain | Kmc |
Brakes
| Brakes | Shimano BR-M416 Disc brakes, Shimano M421 levers |
|---|
Cockpit & Contact Points
| Headset | Cane Creek C.N.C. |
|---|---|
| Handlebar | FSA Metropolis |
| Handlebar Extensions | Not included |
| Stem | FSA Metropolis |
| Saddle | RMB Urban Water Proof |
| Seatpost | FSA Metropolis, 31.6mm diameter |
Wheels & Tires
| Hubs | Front: Shimano HB-M435, Rear: Shimano Alfine |
|---|---|
| Rims | Alex TD-24 |
| Spokes | Stainless stainless |
| Front Tire | 28 x 1 5/8" CST Salvo |
| Rear Tire | 28 x 1 3/8" CST Salvo |
| Wheel Size | 28" wheels |
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Gearing
Original gearing is incomplete. Enter your setup to calculate ratios and cadence speeds.
Try your current gearingChanged tires or gears? Calculate your setup.
Your changes apply to this calculation. The archived build stays unchanged.
Gearing results
| 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
Find replacement parts
Shimano BR-M416 Disc brakes
Shimano M421 levers
FSA Alloy
45t teeth
More parts (3)Fewer parts
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Parts and service referenceQuick reference before buying parts
Archived specifications for reference. Check the fitted parts before ordering.
- Front tire
- Front: 28 x 1 5/8" CST Salvo, Rear: 28 x 1 3/8" CST Salvo
- Drivetrain
- Shimano mix
- Seatpost diameter
- 31.6 mm
- Bottom bracket / shell
- Cartridge TH 7420 W/Super Water Seals
Equipment inspection checks 10 checks based on 5 archived component groups Open equipment checksClose equipment checks
Checks selected from the archived equipment. Confirm what is fitted today. This is not a complete safety inspection; use the full inspection guide before test riding.
Full used-bike inspection guide →
Frame and fork
Inspect the frame and fork →Archived: Frame: Custom RMB · Fork: Alloy · Alloy
Drivetrain
Check drivetrain wear →Archived: Group: Shimano mix · Shifters: Shimano Alfine Rapidfire · Rear derailleur: Shimano Alfine · Crankset: FSA Alloy, 45t teeth · Bottom bracket: Cartridge TH 7420 W/Super Water Seals · Cassette: Shimano · Rear cogs: 20 teeth · Chain: KMC
Brakes
Inspect the brakes →Archived: Brakes: Shimano BR-M416 Disc brakes, Shimano M421 levers
Wheels and tires
Check wheels and tires →Archived: Wheel size: 28" wheels · Rims: Alex TD-24 · Hubs: Front: Shimano HB-M435, Rear: Shimano Alfine · Front tire: Front: 28 x 1 5/8" CST Salvo, Rear: 28 x 1 3/8" CST Salvo
Controls and contact points
Archived: Headset: Cane Creek C.N.C. · Handlebar: FSA Metropolis · Stem: FSA Metropolis · Seatpost: FSA Metropolis, 31.6mm diameter · Saddle: RMB Urban Water Proof
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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.