Lowest1.00:1
Highest4.00:1
Total range400%
Estimated speed At 90 RPM
Lowest gear
Highest gear
Uses front tire 26×2.1; rear size isn’t listed.
Velopedia Bicycle Archive
1993 Jamis Ukiah
Original specifications: Shimano Altus C20 drivetrain · 26" wheels · 29.9 lb published weight.
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No archive photo is available for this record.
At a glance
Archive #40799- Model year
- 1993
- Category
- Mountain
- Original MSRP
- $365.00
- Sizes
- 16, 17.5, 19.5, 21.5, 17.5WM
- Weight
- 29.9 lb
- Geometry
- Legacy reference
- In this record
- 20 specifications · original MSRP · geometry
Model history 3 other years
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Identification clues
1993 archived details
- Frame
- MTB chrome-moly main tubes
- Original equipment
- Shimano Altus C20
Clues, not proof of model year. Colors vary and components may have been replaced.
Original buildMTB chrome-moly main tubes · Shimano Altus C20 · 26" wheels
Frameset
| Frame Construction | TIG-welded steel |
|---|---|
| Frame Material | MTB chrome-moly main tubes |
| Fork | Chrome-moly unicrown |
Drivetrain
| Component Group | Shimano Altus C20 |
|---|---|
| Shifters | Shimano Altus C10 Rapidfire Plus |
| Front Derailleur | Shimano Altus C20 |
| Rear Derailleur | Shimano Altus C10 |
| Crankset | Shimano Altus C20, 28/38/48 teeth |
| Rear Cogs | 7-speed, 12 - 28 teeth |
| Chain | Shimano CN-HG50 |
| Pedals | Wellgo Low Profile High Impact Resin |
Brakes
| Brakes | Shimano Altus C20 brakes, levers |
|---|
Cockpit & Contact Points
| Handlebar | Jamis Bulge Bar |
|---|---|
| Stem | Jamis Chromoly, Drilled Stop |
| Saddle | Jamis/Viscount ATB Anatomical |
| Seatpost | 300mm w/Quick Release |
Wheels & Tires
| Hubs | Shimano Exage |
|---|---|
| Rims | Weinmann 2719, 36-hole |
| Front Tire | 26 x 2.10" Kenda |
| Wheel Size | 26" wheels |
No specifications match. Try a component name or clear your search.
Geometry
Historical measurements. Frame size unknown.
Reference drawing
Size
Measurement
Measurement
—
Select an available measurement to locate it on the frame.
All geometry measurementsLegacy reference · 6 measurements
| Measurement | Legacy reference |
|---|---|
| Top tube | 541 mm |
| Head-tube angle | 70° |
| Seat-tube angle | 70° |
| Chainstay / rear center | 429.3 mm |
| Wheelbase | 1050.8 mm |
| Fork offset / rake | 48.3 mm |
Frame size not recorded.
Gearing
Lower gears help on climbs. Higher gears suit higher speeds.
RPM
RPM = pedal turns per minute.
How it works
Ratio = front teeth ÷ rear teeth. Hub gears also include the hub’s internal ratio. A 400% range means the highest ratio is four times the lowest.
Speeds are estimates from tire size and pedal cadence. Actual speeds vary.
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
26 x 2.10" Kenda
Replacement search: 26x2.1 bicycle tire Before ordering: Check rim type and tire clearance.
Wellgo Low Profile High Impact Resin
More parts (5)Fewer parts
Shimano Altus C20
28/38/48 teeth
Shimano Altus C20
Shimano Altus C10
Shimano Altus C10 Rapidfire Plus
Shimano Exage
Based on the original build. Check fit and installed parts before ordering. Affiliate links may earn Velopedia a commission. As an Amazon Associate I earn from qualifying purchases.
Parts and service referenceQuick reference before buying parts
Archived specifications for reference. Check the fitted parts before ordering.
- Front tire
- 26 x 2.10" Kenda
- Drivetrain
- 7-speed
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: TIG-welded steel · Fork: Chrome-moly unicrown
Drivetrain
Check drivetrain wear →Archived: Group: Shimano Altus C20 · Shifters: Shimano Altus C10 Rapidfire Plus · Front derailleur: Shimano Altus C20 · Rear derailleur: Shimano Altus C10 · Crankset: Shimano Altus C20, 28/38/48 teeth · Rear cogs: 7-speed, 12 - 28 teeth · Chain: Shimano CN-HG50
Brakes
Inspect the brakes →Archived: Brakes: Shimano Altus C20 brakes, levers
Wheels and tires
Check wheels and tires →Archived: Wheel size: 26" wheels · Rims: Weinmann 2719, 36-hole · Hubs: Shimano Exage · Front tire: 26 x 2.10" Kenda
Controls and contact points
Archived: Handlebar: Jamis Bulge Bar · Stem: Jamis Chromoly, Drilled Stop · Seatpost: 300mm w/Quick Release · Saddle: Jamis/Viscount ATB Anatomical · Pedals: Wellgo Low Profile High Impact Resin
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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.