
Velopedia Bicycle Archive
2021 Jamis Hudson Disc
Hybrid bicycle from the Velopedia specification archive.
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What Velopedia knows
- Model year
- 2021
- Category
- Hybrid
- Original MSRP
- $839.95
- Sizes
- 17″, 19″, 21″
- Colors
- Ink, Rhino
- Geometry
- 3 manufacturer sizes · Geometry context
- Record coverage
- 22 preserved details · 3 archived images · original MSRP · preserved geometry
- Archive ID
- 900001721
Frameset
| Frame Construction | 6061 TIG-welded aluminum, Hudson laid-back design with low ride height, alloy kickstand |
|---|---|
| Frame Material | Aluminum |
| Fork | Hi-tensile unicrown with radiused blades |
Drivetrain
| Component Group | Shimano Altus RDM-2000 |
|---|---|
| Shifters | Shimano Altus SL-M2010-9R, 9-Speed |
| Rear Derailleur | Shimano Altus RDM-2000 |
| Crankset | Forged alloy crank, single 40T chainring, 170mm, with full length chainguard |
| Bottom Bracket | Sealed cartridge, 68 x 122.5mm |
| Cassette | Sun Race CSM90-9AW 11-36T |
| Chain | KMC Z9 |
| Pedals | Comfort platform with TPE non-slip insert |
Brakes
| Brakes | Tektro HD-M275 hydraulic disc brake |
|---|
Cockpit & Contact Points
| Headset | Internal cup, threaded, 1 1/8” |
|---|---|
| Handlebar | Comfort hi-rise, alloy 25.4 x 80mm rise x 15 ̊ sweep x 640mm |
| Stem | Jamis alloy, 180mm quill x 80mm extension |
| Saddle | Jamis Comfort with memory foam, synthetic suede top, burnished side panels and bumper springs |
| Seatpost | Alloy micro-adjust, 31.6 x 300mm, with alloy QR clamp |
Wheels & Tires
| Wheels | Alex DC25 alloy double-wall rims, 36H, Formula alloy QR hubs, 14g black stainless steel spokes |
|---|---|
| Front Tire | CST Metropolitan Palm Bay, 27.5 x 2.35 |
| Rear Tire | CST Metropolitan Palm Bay, 27.5 x 2.35 |
| Wheel Size | 27.5 |
Size-specific frame data
Geometry
Manufacturer-published geometry normalized for consistent archival comparison. Effective top tube and reach remain separate measurements because they describe different aspects of fit.
| Measurement | 17″ | 19″ | 21″ |
|---|---|---|---|
| Effective top tube | 597 mm | 627 mm | 648 mm |
| Head tube | 160 mm | 180 mm | 200 mm |
| Head-tube angle | 68° | 68° | 68° |
| Seat-tube angle | 67° | 67° | 67° |
| Chainstay / rear center | 485 mm | 485 mm | 485 mm |
| Wheelbase | 1111 mm | 1141 mm | 1162 mm |
| Bottom-bracket height | 286 mm | 286 mm | 286 mm |
| Standover height | 761 mm | 797 mm | 824 mm |
| Fork offset / rake | 55 mm | 55 mm | 55 mm |
Geometry source: Jamis first-party geometry table (2021 GEO - HUDSON) ↗ Measurements can vary by configuration, wheel size, or flip-chip position where noted by the manufacturer.
Geometry tools
Analyze a published size
17″ geometry
Archive context: The head angle of 68° sits toward the slacker end. The seat angle of 67° sits toward the more relaxed end. The chainstay of 485 mm sits toward the longer rear-center end.
Compared with 18 distinct hybrid geometries in the Small-equivalent size cohort from model years 2021–2023 in the Velopedia archive.19″ geometry
Archive context: Its wheelbase of 1141 mm sits toward the longer end. The head angle of 68° sits toward the slacker end. The seat angle of 67° sits toward the more relaxed end.
Compared with 17 distinct hybrid geometries in the Medium-equivalent size cohort from model years 2021–2023 in the Velopedia archive.21″ geometry
Archive context: Its wheelbase of 1162 mm sits toward the longer end. The head angle of 68° sits toward the slacker end. The seat angle of 67° sits toward the more relaxed end.
Compared with 17 distinct hybrid geometries in the Large-equivalent size cohort from model years 2021–2023 in the Velopedia archive.Parts & serviceability
Find replacement parts
More qualified parts (3)
Searches use the archived manufacturer specification, not the components currently installed on a particular bicycle. Confirm the exact model, size and fit before ordering. As an Amazon Associate I earn from qualifying purchases. Velopedia may also earn from qualifying eBay purchases. Velopedia may also earn from qualifying retailer purchases. Commercial relationships do not influence Archive specifications or analysis.
Used-bike inspection
If you’re buying this bike used
Before any test ride: both brakes should stop the bike firmly and release cleanly; both wheels should run true and be securely attached; tires should have no casing damage; and the headset, handlebar, stem, cranks and pedals should have no looseness or play.
Follow the full used-bike inspection order →- FrameLook closely for dents and hairline cracks around welds, the head tube and bottom-bracket area. Cosmetic scratches matter less than a change in shape or a crack line.Inspect the frame and fork →
- BrakesBoth levers should feel firm and return cleanly. Check for fluid around the levers and calipers, inspect pad thickness and contamination, and look for worn or bent rotors.Inspect the brakes →
- DrivetrainShift through every gear under light load and measure chain wear. Confirm that the shifter, derailleur, chain and cassette belong to the same 9-speed system.Check drivetrain wear →
- Wheels & tiresSpin both wheels and watch the rims for side-to-side or vertical movement. Check for dents, cracks, loose or uneven spokes and hub play, then inspect both tire casings for cuts, cracking or exposed threads.Check wheels and tires →
Bike-specific inspection checklist 19 checks based on 5 archived component groups Open checklistClose checklist
This checklist uses the archived equipment for this bike. It cannot confirm the condition, service history or later component changes of the example in front of you.
Identity and fit
Follow the full used-bike inspection order →Archived: 2021 Jamis Hudson Disc · Hybrid · Published sizes: 17″, 19″, 21″
Frame and fork
Inspect the frame and fork →Archived: Frame: 6061 TIG-welded aluminum, Hudson laid-back design with low ride height, alloy kickstand · Fork: Hi-tensile unicrown with radiused blades
Drivetrain
Check drivetrain wear →Archived: Group: Shimano Altus RDM-2000 · Shifters: Shimano Altus SL-M2010-9R, 9-Speed · Rear derailleur: Shimano Altus RDM-2000 · Crankset: Forged alloy crank, single 40T chainring, 170mm, with full length chainguard · Bottom bracket: Sealed cartridge, 68 x 122.5mm · Cassette: Sun Race CSM90-9AW 11-36T · Chain: KMC Z9
Brakes
Inspect the brakes →Archived: Brakes: Tektro HD-M275 hydraulic disc brake
Wheels and tires
Check wheels and tires →Archived: Wheel size: 27.5 · Wheels: Alex DC25 alloy double-wall rims, 36H, Formula alloy QR hubs, 14g black stainless steel spokes · Front tire: CST Metropolitan Palm Bay, 27.5 x 2.35 · Rear tire: CST Metropolitan Palm Bay, 27.5 x 2.35
Controls and contact points
Archived: Headset: Internal cup, threaded, 1 1/8” · Handlebar: Comfort hi-rise, alloy 25.4 x 80mm rise x 15 ̊ sweep x 640mm · Stem: Jamis alloy, 180mm quill x 80mm extension · Seatpost: Alloy micro-adjust, 31.6 x 300mm, with alloy QR clamp · Saddle: Jamis Comfort with memory foam, synthetic suede top, burnished side panels and bumper springs · Pedals: Comfort platform with TPE non-slip insert
Before and during the test ride
Follow the full used-bike inspection order →Build relationships are limited to the archived manufacturer specifications. Confirm exact fit and standards before ordering parts or performing service.
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Gallery
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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.




