Velopedia Bicycle Archive

2021 Jamis Hudson Disc

Original specifications: Shimano Altus RDM-2000 drivetrain · 27.5 wheels · geometry for 3 published sizes.

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At a glance

Archive #900001721
Model year
2021
Category
Hybrid
Original MSRP
$839.95
Sizes
17″, 19″, 21″
Colors
Ink, Rhino
Geometry
3 manufacturer sizes
In this record
21 specifications · 3 archived images · original MSRP · geometry
Campaign
Original buildAluminum · Shimano Altus RDM-2000 · 27.5

Manufacturer catalog

Published sizes and colors

3 sizes · 2 colors

Manufacturer-published sizes and colors; availability and exact size/color pairings may vary by market or production run.

Published sizes

17″19″21″

Published colors

InkRhino

Frameset

Frame Construction6061 TIG-welded aluminum, Hudson laid-back design with low ride height, alloy kickstand
Frame MaterialAluminum
ForkHi-tensile unicrown with radiused blades

Drivetrain

Component GroupShimano Altus RDM-2000
ShiftersShimano Altus SL-M2010-9R, 9-Speed
Rear DerailleurShimano Altus RDM-2000
CranksetForged alloy crank, single 40T chainring, 170mm, with full length chainguard
Bottom BracketSealed cartridge, 68 x 122.5mm
CassetteSun Race CSM90-9AW 11-36T
ChainKMC Z9
PedalsComfort platform with TPE non-slip insert

Brakes

BrakesTektro HD-M275 hydraulic disc brake

Cockpit & Contact Points

HeadsetInternal cup, threaded, 1 1/8”
HandlebarComfort hi-rise, alloy 25.4 x 80mm rise x 15 ̊ sweep x 640mm
StemJamis alloy, 180mm quill x 80mm extension
SaddleJamis Comfort with memory foam, synthetic suede top, burnished side panels and bumper springs
SeatpostAlloy micro-adjust, 31.6 x 300mm, with alloy QR clamp

Wheels & Tires

WheelsAlex DC25 alloy double-wall rims, 36H, Formula alloy QR hubs, 14g black stainless steel spokes
Front TireCST Metropolitan Palm Bay, 27.5 x 2.35
Rear TireCST Metropolitan Palm Bay, 27.5 x 2.35
Wheel Size27.5

Geometry

3 sizes · 9 measurements

Frame measurements by size.

All geometry measurements3 sizes · 9 measurements
Measurement17″19″21″
Effective top tube597 mm627 mm648 mm
Head tube160 mm180 mm200 mm
Head-tube angle68°68°68°
Seat-tube angle67°67°67°
Chainstay / rear center485 mm485 mm485 mm
Wheelbase1111 mm1141 mm1162 mm
Bottom-bracket height286 mm286 mm286 mm
Standover height761 mm797 mm824 mm
Fork offset / rake55 mm55 mm55 mm

Dimensions as recorded.

Gearing

Lower gears help on climbs. Higher gears suit higher speeds.

RPM

RPM = pedal turns per minute.

All published sizes40T · 11–36T · 9-speed
Lowest1.11:1 Highest3.64:1 Total range327%
Estimated speed At 90 RPM Lowest gear8.2 mph Highest gear27.0 mph

Rear tire: 27.5×2.35.

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 other gearing

Try your current gearingChanged tires or gears? Calculate your setup.

Your changes apply to this calculation. The archived build stays unchanged.

Your gearing setup
Gears

Use up to three front tooth counts, separated by /. For one rear sprocket, enter the same count twice.

Rear tire

Apply the marking on your rear tire or edit its dimensions below. Older or fractional inch sizes need the ISO marking (e.g. 37-590).

For 32-622, width is 32 mm and rim diameter is 622 mm. Use the rear tire on mixed-wheel bikes. Leave both fields empty to compare ratios only.

Gear, dimension and cadence changes update results automatically.

Speeds are estimates. These calculations do not establish component compatibility or available tire clearance.

Parts & serviceability

Find replacement parts

Original specifications
Seatpost · Original
Alloy micro-adjust

31.6 x 300mm, with alloy QR clamp

Retailer offers
Chain · Original
KMC Z9
Front tire · Original
CST Metropolitan Palm Bay

27.5 x 2.35

More parts (3)Fewer parts
Brake pads · Original
Tektro HD-M275 hydraulic disc brake
Rear derailleur · Original
Shimano Altus RDM-2000
Shifters · Original
Shimano Altus SL-M2010-9R

9-Speed

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.

Service essentialsQuick reference before buying parts

Archived specifications for reference. Check the fitted parts before ordering.

Front tire
CST Metropolitan Palm Bay, 27.5 x 2.35Check: Verify the fitted tire’s size marking and rim type.
Rear tire
CST Metropolitan Palm Bay, 27.5 x 2.35Check: Verify the rear size; it may differ from the front.
Drivetrain
9-speedCheck: Match the installed drivetrain family, not just its speed count.
Seatpost diameter
31.6 mmCheck: Read the post’s diameter marking; seat-clamp size differs.
Bottom bracket / shell
Sealed cartridge, 68 x 122.5mmCheck: Verify shell type and width, crank interface, and spindle length or spacers.
Bike-specific inspection checklist 19 checks based on 5 archived component groups Open checklistClose checklist
0 of 19 checked Progress stays in this browser for this record.

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.

Archived: 2021 Jamis Hudson Disc · Hybrid · Published sizes: 17″, 19″, 21″

Archived: Frame: 6061 TIG-welded aluminum, Hudson laid-back design with low ride height, alloy kickstand · Fork: Hi-tensile unicrown with radiused blades

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

Archived: Brakes: Tektro HD-M275 hydraulic disc brake

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 →

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Gallery3 images

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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.

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